360 head porting for big power (500HP ?)

Abodybomber said
Beautiful work! Never seen 302 castings go more than 250-ish. Never seen a valve guide boss eliminated,before. Nice attention to all aspects. Nice match,with the cam.

These are not '302' 318 heads we're discussing, but rather the '308' 89-91 roller 360. Precursor to the Magnum head.