440 source

My dad is running the 440source heads. Changed the locks/retainers, did a quick bowl cleanup (2 to 3 minutes per port), and slapped them on. The car went from 13.0s with 3.23s and the old home-ported 906 heads to 12.6s with no carb tuning. He went from stamped to 1.5 roller rockers at the same time, but I'd say most of the gain was from the heads.

If I had a big block, I'd run em.