I suggested the "Rams Horns" as I have a colleague with them in his EARLY 60s vette. However, I failed to remember that they're the Bowtie small port Vortec-type head, which has provisions for the early valvecovers. I dont know if he had to do any clearancing or use spacers; but they ARE on there. Sad thing is, its a balmy ZERO out, and I can't get pics until March or so. So Hogg and I are both right to some degree.
Incidentally the Vortec Bowtie heads are bad *** iron heads, especially when I think he paid $700 for the pair