340 cam change

we can recommend cams till the cows come to roost, but without knowing what the compression ratio is roughly, kinda, sorta, or there abouts, all of this is mental masturbation.

you've got gear, and you're willing to up the stall which is like, half the equation of camshaftery.

on the motor you've got good bones with the heads, intake, carb, headers & ignition.

figure out that last piece of the puzzle and then you can get a better handle on what cam(s) you should be looking at. because for all we know it's 9:1 and that ain't gonna fly with 500+ lift and 280 duration.