8 3/4 woes

Stick or trans brake car? If you go with Dana you will be able to reuse your axles and brake assemblies. I don't think 4.30s are available, but a one inch taller tire will compensate the difference. Depending on your trap rpm, 4.56 may work better, and a Dana will use less power to run than either an 8-3/4 and especially a 9 inch Ford.