Some aftermarket bells have enough material to redrill for a R5 pattern. Then you just need a flywheel with 130 tooth starter gear. Then just run the mopar starter. Pretty simple. It is not legal with SFI to redrill the bell. That is considered a modification. If you get the same thing done with a Browell bell you can bolt right up and use a Mopar starter. Less stuff to do with the flywheel if you have a chevy style flange on the crank.

The R5 to Mopar small block overlaps the dowel pins and a couple bolt holes. The above the starter is almost unuseable. I don't know on the R5 to chevy bell. Have seen them but, don't remember how bad it is. I think the dowels are better.