Ls1 5.7 firehawk
Matt
With those heads, a custom grind cam, and some longtubes/ true duals you should be able to reach your goals.
Add an ls6 intake if you can find one for a reasonable price.
Then, it's all about the tune.
The previous poster just gave you a recipe for over 400rwhp.
For 400flywheel hp full exhaust, CAI and a tune should get you there.
Matt
Check out this FAQ posted in the Newbie section. It's a little dated but there's good info about what mods to avoid and which ones are worth while.
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For a run of the mill 1974 Nova?!