340 Modifications

Getting ready to start searching for ways to squeeze some more power out of my 340. The date on the block is 10-16-70, so i assume that it is the higher compression version. It is in a 69 Formula S Cuda. It has 3.23 gearing behind a rebuilt 727 with a shift kit( a kit not of my liking). I believe the internals are basically stock for the engine's date.

I want to change the cam out to something a little more radical. I would like to keep some of the bottom end, but it is a 340 and can rev higher than a 318, so i don't mind stepping it up. I want to have a cam with a lopey, rumpity rump idle that retains great power. I believe it still has a close to stock converter for the 340, maybe a tad more aggressive than that if i can remember correctly from when i bought it.

What grind, duration, type of cams would best fit what im looking for?

Also, it's not the main question, but will an RPM or Airgap intake fit under the stock 69 Cuda hood with a Carter carb and 3" air cleaner? What carb cfm?
Thanks again everyone.