Ignition dwell and adjusting it.

I have a 1970 dart that had a slant 6. Bought the car and it had been sitting for 18 years. A new battery and some oil down the in cylinders had it cranking over well but no fire. I found the wire between the points and coil had been consumed by rodents. So i pulled the distributor replaced the wire, lightly sanded the points and she ran great for about 25,000 miles with absolutely nothing more than oil changes. That is the extent of knowledge I have with points.

I've pulled the slant and swapped it for a 5.9 magnum. Along with the engine swap I installed a edelbrock air gap and used 1406 carb, MSD coil, Doug's headers, and 2.5 inch dual exhaust. Trans is a stock 727 with a shift kit. I had a V8 dart parts car and ended up using the points distributor. I replaced the points, condenser, and vacuum advance. The car starts, runs and drives alright. The carb needs some work and seems to run rich at idle no matter how it's adjusted. But drives fine.

But in the back of my head I keep thinking I REALLY should set the points properly. I dont know the first thing about setting them. There has to be a better way than eyeballing them. So what equipment do I need and how do I go about doing it? And is there any performance to be gained if the car already runs as is?

P.S. I know points are outdated and electronic ignition is better. But they worked for decades and were reliable on my slant. So theyll work for now.