Best bolt ons for a small block

Most original Chrysler distributors will be phased pretty good. Certainly won't hurt to check. Where you need to modify will most likely be the advance curve. A performance advance curve will have a lot of initial advance at idle but a narrow band of mechanical (total) advance. My slant 6 for example, I have about 19 degrees initial advance at idle and about 29 degrees total, so I have 10 degrees mechanical advance. I reduced the mechanical advance by disassembling the distributor, welding up the governor slots and then grinding them back out smaller than factory. This allows you to run a lot of initial for quick acceleration but limits the total advance so you don't end up with too much on the "other end".