Moving the radiator support sounds like a bad idea, but I'm not sure what you mean or what you did. Could you please provide some photos so that we can try to help out?
My '46 has a full S-10 frame with a 455 Buick and I didn't move the rad support, but I did change where the rad mounts. Mind you I don't know if yours is a Chevy or GMC. They had different rad supports.
