From "460Ford.com"....
Tips and tricks to maximising power in the 73-86 460.
1. Timing set change; 72 and up have an 8* retard in the timing set stock. Install a 69-71 timing chain set (double roller is also a good upgrade)....
...no mention of camshaft retard.
"Well the trick is, use earlier heads without the bump. Everything is better."
After light porting and smog bump removal, they flow about the same. The early (D0VE) have smaller closed chambers though.