Eliminating elephant ears, changing headers

I checked it at the PVC and got a better reading. It wants to idle in two places - 500 and 900. When its idling at 500 the timing is 15 and the vacuum is 6-7, then I rev the engine and when it settles down it's at 900 where the timing is 23 and the vac is 11-12.

Apparently the mechanical advance is sticking.