Here’s a few questions to ask yourself. What’s your budget? Heads and parts. Headers? What transmission, rear end and gearing, tire size, car weight.
400 HP out of a 340 is easy, 500 is a little bit harder.
I’m at 400 right now in my 340 duster. It is .30 over, 2.02 J heads cleaned up, not ported with comp magnum roller rockers, 10.2/1 with a comp XE285HL which is a hydro 241/247 on 110. MSD and a 750 double pumper. This a solid build for an Auto, but with a 4 speed sucks until your up on the cam. Ask me how I know.
be prepared to spend a bunch of money if you just have a block as parts add up really fast.
A lot of members here have the 408 from Blue Print. You can’t beat the price unless you know people to get “jobber” pricing on parts and know a machine shop that hood and cheap.
