My Combo, Manifold Or Ported VAC Advance, We'll See...

Fired it up today and let it get up to temp. I twisted the distributor with the vacuum advance disconnected. It really doesn't like much more than 36 at idle.(Although, I have not checked the rotor phasing yet, and I need to do that).

I set it back to 34 degrees. (I am using a lean burn distributor with no mechanical advance.) I will hook it up to ported for now, and do a little driving to see how it works out.

If my rotor phasing is off, I will revisit the manifold advance. Also, whenever I get a real distributor with a curve, I will go through it all again.

The fun continues..!!!
I believe you'll find it hard to start at 34 initial when it's hot. This is when manifold vacuum helps. There's zero vacuum advance until the engine is running so you can run say 16 or more initial and "the rest" comes in when the engine starts.