340 Idle problems

Something screams out at me..1500 rpm is not idle. If it's true 10.5:1. you should be able to idle it down a bit..say, around 1K rpm. Your timing is also way off. You are supposed to have a curve..You dont..It's all in at idle..Thats a lot of your problem, IMO. I'd be running 18* initial, and another 10-12* centrifical. Total of 38-40, starting to comeup around 1500, and all in by 2800. You may need to mess with that dist a bit to get these, but I've found them to be good general settings for an agressive cam in a street compression engine.