dubs- i would nt worry to much about being robbed speed by weight, correct me if im wrong, but the prelude weighs close to the weight of your civic. but like everyone before me said, i would just get stiffer springs up front to even out your ride. i would deffinitly do it, thats a free prelude motor! and depending on the mileage, even if you didnt want it, u could sell it to some one on the forum or ebay for a nice chunk of change and have money to get into other things like a turbo, new wheels, etc., if u already havent done that. well, thats just my .02 on the thread, good luck man.