Do a little research on the part number you’re looking at.
Jegs has it listed as a “cnc” head, but on the speedmaster site, that part number is for an “as cast” head.
I’m guessing they mean “cnc machined”........ not “cnc ported”.

At the Jegs price, that’s pretty cheap money, but they’ll take a little work to before they could be run, and as Brad stated, they take non-std intake rockers.

I’d stay clear of the speedmaster/procomp valves.