Pulling V.A at idle

Bewy said

Timing jumping is probably the engine vacuum trying to pull in the VA plunger but vac is not high enough or stable enough.
So you need to check the T slot as per post #9. Too much T slot gives a rich idle, another one of your symptoms. What size engine, cam?

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One Distributor had a soild line at 2500 or above. That Distributor was built wrong, and probably stiffer springs... mill is a 340, ported J heads, biggest valves you can shove in em, .484 MP cam, Strip Dom, 155 psi w/ forged stock bore TRWS...wanna say she's pulling 9hg. But, it's a xhina gauge