Searched without a solid answer....what kind of power increases, if any, could be expected if you started with the following, all in good working order:
Stock '69 340 "10.5-1" short block
Stock cast intake and exhaust manifolds
Stock 340 or mild cam (450ish lift, 215-220ish @050 duration)
650-750 AVS or Eddy carb.
....and replaced the X heads with a mild aftermarket OOTB head (and i'll define that as Eddys
that have been checked and corrected if needed but no porting, LAXs from IMM, maybe a Magnum-style, etc.) The gasket thickness and chamber volume could be optimized for compression.
Obviously headers, better intake, and more cam would lead to bigger increases. Not really looking for an exact HP#, just wondering what the return would be on a stockish engine.
Thanks...Matt
