Anyways, That was a nice um what do you call it, um something that mom or dad would have said when I was about 16 getting my first car, uh hum I'm 32 I should be able to do what I want now dad...
Uhhh...ok...thanks for being an asshole you retard. You said in your original post that this car is your daily driver/spare vehicle and that the suspension is in really bad shape and the car feels very unstable at high speeds. Given that information, the response I gave you was a perfectly good answer to your question! You can't ask one thing and expect us to know that you really are asking about something else! If you wanted information on how to build your Prelude into a serious performance car than you should have said so instead of beating around the bush about how you want to do some maintenance on your crapped-out daily driver!
And sorry for the fucking lecture, but I'd rather not have you smashing into me or anyone else on the freeway when you're pushing 100+ mph and your crappy suspension and brakes give out! And you're 32 years fucking years old? I'd expect some dumbass shit like that from a 17 year-old jerk-off kid, but seriously...at 32?!? You should fucking know better!
If you plan on hanging out here you should know that you're going to get flamed a lot for posting crap like "yeah I was doing 120 on the freeway yesterday and I raced this Eclipse and kicked his ass yo!" The general consensus around here is that street-racing is stupid and dangerous...if you think your car has some balls then take it to the track and get a time slip; don't go fucking with people's lives just to get your rocks off!
I think it's official at this point:
And from what you've written so far it seems like you don't know much about cars and you don't know much about common sense either! Most newer cars are going to be wobbly and hard to control at speeds exceeding 100, so what the hell did you expect from a 13-year old car that's been beat on for most of it's life?!? If you can't figure out why your crapped out 93 Prelude is wobbling and feels out of control when you hit 100, then you're just plain stupid...I wouldn't dare drive my 94 Accord that fast on a public road, not even after a brake job and a realignment!
If you want a car that handles well at 100+ mph than start saving for a fucking Ferrari or something...
WITH ALL THAT SAID AND OUT OF THE WAY...
As the other people told you, you can improve the car's handling by working on the suspension. New shocks would be a good idea, and some aftermarket lowering springs would both improve your car's appearence and help with cornering abilities. Replacing the bushings in your suspension system may help firm up the ride a bit; polyurethane bushings would be an even better choice. Polyurethane motor mounts are available as well and might also help you attain a smoother ride. Adding strut braces and sway bars can also help improve your car's responsiveness and cornering abilities; new tires should also be on your list if they are needed.
I'd also have the brakes checked out, and replace pads/rotors or have the rotors resurfaced if necessary. You can go aftermarket for rotors if you wish, although there is some debate as to whether slotted and drilled type aftermarket rotors are any better or safer than a regular rotor. I'd say for now just make sure the brakes are in good working order.
As far as the question of your motor I'm sticking to what I said before...at this point an H22 is still probably the best option for your car. If you are concerned about the condition of your current motor, do some general tune up to get started. Check your plugs, wires, air filter, make sure you are up to date on oil changes. If you still think something may be wrong with it, then take it somewhere and have it tested; leakdown and compression tests as Tab mentioned, and if your CEL is on, any decent shop should be able to run diagnostics and assess any problems you may have.
The H22 has potential both as a naturally-aspirated beast or as a boost motor, although the compression on the motor is fairly high so if you want to boost you need to keep the PSI fairly low or you need to open up the motor and do some internal work. Do some research on the site and you should be able to get a better idea of what direction you want to go with your car.