273 for early A

273's are close to 9:1 with flat tops. The pistons are about .02 from the deck. We had to run 675 heads on my brothers 67 to run regular gas. I'd run a 318 crank if you have one in your stash, same balance as a 273 and even a cast 318 crank is pretty stout. The cam is not too big for a 273 in an early Barracuda. If you don't have 64-65 heads you can sell the D4B and get whatever you want, since it is the best intake for those heads. What the specs on the cams that you have in your stash?