comp XE256

If you were going with that cam, I wouldn't even bother.

If you have 8.5:1, like a low compression 340, maybe use the 262 or 268.

If you have a known engine with over 9.5:1 verified, I would use the 274 personally.

..i'm not a racer..strictly street.
Wouldn't the 268 and 274 be lazy with 3.23: gears