430+hp 340 possibilities

Well I can give you some actual track fwhp no's from my '71 street/strip 340 Cuda I ran back in 1985>
T/A 2.02 heads unported, stock v/job, cleaned up, valves just ground in.
stock '71 replacement trw pistons with .039 fel-pro's so around 9.7:1?
1.3/4" hedman race hdrs
DC. .590" [email protected] sft cam
Strip dominator, +2" open spacer+ modded 850DP
car ran a best of 12.40@108 NA at approx 3550@the line = 367fwhp +/- a few.
4200stall and 4.30 gearing on stock springs....just some info that may be of some help.