Electronic ignition upgrade
Contact "DusterIdiot" on the slantsix DOT org forum - I know he recurves distributors, or at least used to. I'm not sure if anyone on this forum does for slant six distributors.
See this thread for more info about going to HEI:
HEI Electronic Ignition Retrofit How-To - Slant Six Forum
It's a very simple setup, cheap, and widely available parts. This is the setup I have. 4 pin module. It's on the same type of bracket shown in the thread I linked. I attached it to a piece of angle aluminum mounted to the 2 holes in the fender that the stock EI module was mounted in, so no modification done to the car.