Cast iron head shoot out

[71broncrollsport]

im building my first 302 and woul like to know the most common oem heads and there application. whats crap and whats good. i have a 71 bronco with stock heads and set with a casting number D20E assuming those are 80's heads. are any of these good?

 

[Bully Bob]

D20E

D=7

2=2 ----- this means '72 heads. '69 & '70 engines had the most HP. :-B