Any thing is possible with the money to go along with it. Seriously though if it were me I would build 250 to maybe 300 and run that for a while. I am also23 and have had a track car in the past, as well as know a rather large group of people that run massive amounts of power in there DD. They are usually spending alot of money maintaining the cars just to keep them in driving condition. with that much power and not alot of skill your clutch will weep, your going to torture axles and half shafts, and other nagging bits that are going to keep you from having fun with the car. From my experience 300 is a very manageable and relatively easy goal to reach where you will not be breaking parts left and right and the engine will not be on the border of ripping its self apart. Being that this is your first build start low and work your way up. You are going to run into problems and the car will me more leaniant to a new tuner. You really need to know what your doing when you want to go for a goal that high. It's a fantastic hobby and I would hate to see you start and get so fustrated that you just give up on the car just because it wont idle or even start up. Personaly I'm building a Del Sol right now as well and looking at a B18 or B16, and if I were you I would be putting in a B18 maybe do a few internal mods then boost it. It is something that every one has done so there is alot of documentation on it and you will make some good power. This will also give you time to learn tuning, wiring, and a base on some engine building. It will also give you time to do suspension and chasis regidity (ie. a cage and other bracing) which is something often looked over by new builders wanting POWER!!!!!! as Jermey Clarkson would so eliquintly put it. Then if you decide to run this with more ponys as your skill goes up or decide this would be a great track car and put someting else on the street all the more power too you. This is gonna make me sound like an old fart, but I was 18 too once and had a 250HP Subaru that was AWD and it got me in to enough trouble. I would hate to see some ones pride and joy end up rubber side up in a ditch. Just remember the instant it becomes a project car as well as a DD you are no longer building just for power, you are also building for reliability. Those two things tend to be inversely proportionate to each other. Again what ever you decide to do good luck with it this can be alot of fun if you can fight through the frustrations.