A QUICK QUESTION ABOUT MANIFOLD VACUUM

Just plying around...........

Found that the engines happy place idling is 25* BTDC. Unfortunately, I found that it bucks the starter a bit when it's warm. I fashioned a "stop" for the vac can and adjusted the VA spring with the least amount of tension (comes in at 9 and stops at 14 vac).

I am now running manifold vac limited at 15* and 10* base for my 25* idling. Manifold vac is now 17 and steady at idle, and steady (new gauge) at 21 at 1700.

I have 3.23's and a 2600 -2800 stall in the Demon. What would be a good timing curve starting point to consider with the above listed parameters? The engine has 175psi warm cranking pressure in all 8.

The engine is still on my run stand.

Thanks FABO