I recently fitted a 123ignition distributor that I bought from IAP for $395. I am happy with it so far. It works with the standard coil. Others prefer the distributor that is sold by Centerline. There has been plenty of discussion about them on the board. A search should give you lots of information.
I have a 79 Spider with Webers, a ported head, high performance cams, 10:1 pistons, & headers.