69 340 timing chain questions - help!!

Glad to see it's fixed. I had almost forgotten about this, but years ago I bought a 273 factory dual point distributor for my car. Went through it, new points, condenser, cap, & rotor, just for good measure, before I put it in. Same kind of problem. It would run great & then start stumbling & generally run like crap. Cool it off & it'd run good again. Figured out the distributor was the problem because it did the same thing in my friends Challenger. Turned out the new condenser I bought was defective. Bought another condenser it was fixed.