i'm not sure how much of this you know, so don't be insulted if you know most/all of this. i'm just givin' you the run down on swapping engines. the ls engine is the b18a or b18b out of '90-'00 integra ls, gs, rs and se models. it is commonly refered to as the ls engine because it came in the integra LS... although it came in other model integra's the ls was the most common. you're gonna want the b18a because it is an obd0 engine, as which is your car. the year of the car determines the obd version. pre '92 cars are non-obd or obd0, '92-'95 cars are obd1 and '96+ cars are obd2. for simplicity of wiring when swapping an engine it is best to stay within the same obd with the car and engine. if you swap in an engine from a differant obd you'll have to backdate or update the electronics (ecu, injectors and distributer) as well as do a lot more wiring as the higher the obd the more sensors the engine has. another thing to think about when doing a swap is the tranny, it is also a good idea to stick with a cable clutch if that is what came in your car and vice versa for hydro trannys. as for the ls, there are a couple options for you to choose from... you can either leave the engine in stock form and turbocharge or supercharge it as it is a very boost friendly engine because of the low stock compression ratio, long gearing and very mild cams with pretty low overlap, all of which turbo/superchargers thrive on. the other route is to do a headswap with a b16a SiR which is a vtec head. you could choose other vtec heads, but the b16a SiR head is obd0 (others are obd1+) and is the easiest to get a hold of. this setup is commonly know as a ls/vtec because you are using the ls block with a vtec head. let me know if you have any other questions. by the way, if i was you, i'd go the turbo route.