If your distributor number is 2875334 then it is from a 1968 273 V-8. It is a Chrysler made distributor. .017 gap [28-32 dwell]. Any used 318 or 273 vacuum advance unit should work. Polish your 8 sided dist. cam with 600 or 1000 grit paper. Use a little dist. cam lube on the cam. About 3 drops of light oil into the felt pad under the rotor. Free up the weights under the points plate and lube. When working properly, the rotor should turn about 1/2" in one direction and then spring back to where it was. This is done with the dist. shaft held in a vice.
I would not recommend a dual point dist. They require special tiny wrenches and lots of patience. And would be very very difficult to do on the side of the road. Back in the day, I'd check/adjust the dwell every 5000 miles, and change point and condenser every 10,000 miles. Echlin or Chrysler was my choice. My local hardware store used to stock Chrysler, Delco, and Motorcraft tune up kits [points, condenser, and rotor for under $10]. Those days are over, the kits are gone, and the store is gone.
