Hi guys and gals, I bought a set of freshened-up heads from our race team. I'd like to use them on an 11-1 406" SBC I'm building for a'53 Willys wagon gasser . They came on a motor we bought just for the short-block. Anyway, they are World Products # 12442. I can't find anything about them on the old interwebs. They have large ports and appear to have 2.05 intakes and 1.60 exhaust valves. I THINK they have 64cc chambers. Anyone know what I have?.