Was talking to Rod Bloomer yesterday. Has a guy he recently sold a 416 to, with his new heads.
It was for a project that got put on the back burner, so he sold it.
flat top pistons, runs on pump gas. Ported super victor, 1000cfm 4150 carb, healthy roller cam.
this engine was on the dyno at BES and made right at 680 horsepower
anyhow, guy has a 3315 pound A Body, had it at Edgewater( Cincinnati) last weekend and went 135 mph with huge issues keeping it off the bumper( cal tracks)
Figures it will go 137-138 once he gets it sorted out.
At this point, not much doubt those are the most bad *** bolt on replacement head out there. Plenty of evidence now with on track testing.