What can you tell me about these heads
 

Purchased a set of Bowtie 18 degree heads and an intake. I'm looking for some info on these heads. They are casting #10134363. 58cc combustion chamber. Any insite regarding a cam recommendation or anything else would be greatly appreciated. Putting them on a 421 SBC. The intake is #10185053. thanks.....;)

Re: What can you tell me about these heads
 

look at the GM performance site--these are 18 degree Nascar 9-1 heads & manifold---tells you about correct rockers/gaskets etc--Comp 387