Radiator Support Question

I'm doing a big block conversion and I need to know if there is a difference between small and big block support's. My car came with a 307 w/ AC and the opening measure's 21" wide x 15" high. I've seen some new support's advertised with a 23" opening. Do I need to change my mine or will it work? I'm going to put AC back on and use a good aluminum radiator to help cooling. Will I see any issue's with this. Thanks

The factory BB support had a 23" opening....your small block unit can be opened up and modified to be correct for the BB conversion. Avoid the repop units they are junk....if you need more details send me a PM. I can also hook you up with someone who can modify the existing support and make it correct for the BB including the radiator mounting.

wilma:)