Need help with engine problem

[drdave69]

I will try a 12v jumper to the hei after I double check tdc. As I stated, there is no degree indicators on the balancer or indicator. Just a single line. The engine is as it came from GM and I have not changed or adjusted anything. It just all of a sudden started running this bad after a new clutch and exhaust (went from 3" to 2-1/2" side pipes). I checked the advance mechanism in the hei and it is not binding. From what I have read the timing should be 10 deg and I assume that is what the single line indicator is for. I do not know what the valve adjustment specs are for this engine.