I just ran across some pictures of a '63 with a 4 link backhalf. The frame connectors were put in wider and straight as suggested above and then a triangular boxed support was welded in to the 4 link bracket location.

This is what I will do. Any problems forseen doing it this way??

Thanks,
Greg.

1.50 60Ft. , 10.75@ 127MPH Hauling 3900 LBS.