I've got a few items for sale that might interest.
First is a Jaycar programmable ignition unit. Can either take an input from your existing distributor and modify the advance curve to what you want - or better lock the advance mechanism and programme your own. Much cheaper than replacing a worn distributor - and better. It has a built in MAP sensoryou connect the vacuum to. Also a knock sensor board - which isn't essential to use. It has an external coil driver module, so you can remove the ignition amp and drive it direct from the reluctor. Or points. Or other triggers.
You can buy some of them ready made - but look at the prices.