another option people are yakkin about...

you take a 318, preferably one of the older truck versions with a forged crank. you get a cheap ebay GT45 turbo that just happens to be the right size for a 318 about $250. grab some 2.02 heads, compression can be 8:1 or so, dont matter. should not be higher. you use truck exhaust manifolds turned around backwards. a little bit of fab work. you can use an E85 blow thru carb for some detonation resistance. some sort of intercooler & misc hardware. run 8lbs of boost. quick/cheap 500-600hp lol.