Largest cam in 351W without cutting the pistons (Looking at AFR185s)

[86GT]

There are too many variables for someone with just cam specs and valve size specs to make a determination.

Deck height, piston valve notches, head gasket thickness, and many others. That's what its important to check. That being said, why don't you get the heads you like, the cam that'll suit the heads and intake and then put it together to check. Worst case scenario you have to notch the pistons. I've done it with a dremel and have had no problems whatsoever. That's with a 302 (stock bottom end), 2.02 Edelbrock heads, TFS Stage 2 cam. .544, .563 224, 232 duration at 0.050".

Hope that helps a bit.