And yes, there is a .620 purple shaft in the basement just in case anyone wants one.
I am porting a set of speedmaster heads for my son in Colorado and will be checking a couple purple shaft cams I have. I’m almost positive I have a 501 cam that they recommended for four speeds but hopefully have a 484 lift cam. He purchased a 340 so that would work perfect in the 1974 duster he is rebuilding. He just bought a J convertor while he was home from a buddy of mine. I’m trying to help as much as I can but I’m 2400 miles away.