Maximum advance curve on my 360

ALL DONE!!
I have replaced the iron heads with Edelbrock performer alloy heads part# 60779's. I noticed that the Comp cams Xe274 I had in there, three lifters were not spinning all the time. They had wear indications of this on the lifters. This opened up a bigger job for me. I removed the cam and had it reground to a custom grind. The mass produced cams we buy are ground to suit the smaller lifter diameters of the Chevs and are not suited for Chrysler. They do not accomodate this since all these profiles are derived around GM and the only difference is the cam blank billet they stick into the machine. Comp Cams don't grind ther flat tappet cams. They are contracted out. They only grind there roller cams.
I found an old timer cam grinder which has been in the game for over 30 years and he measured the cam lobes to be 2.5 thou tapper. Also the noise that that these extreme energy cams produce was pissing me off. This was because of that aggressive ramps they have for opening and closing the intake valve. He refaced the cam to suit .904" lifters and machined a 4 thou tapper on the lobes. Also he slowed up the intake ramps. The 0.050" specs are the same. 230/234 degrees. All that tappet rattle dissapeared, The lifters spin like a yo-yo and the advance is at 30 -32 degrees (will go to 36 and try that as well) and there is no sign of detonation. I also received a full printout of the before and after specs of the cam from 0.004" to full lift. Car goes like a rocket.
My conclusion is that the iron heads were no good. They had hot spots in them.
Thanks for all your replies.
Billy