timing my propane engine: 350, RV cam, 11:1, MSd HEI disitributor, thinking 14* base and about 38 spun, plus 3* vacuum advance? What are you guys happy with?

i was told to advance it the most you can , then retard it a little from there...... thats the best spot mine ran at. im running msd mechanical advance and at high rpm im at 34 degrees. seemed to work best for me

bring the mechanical in by 2700rpm, I have 26°
base I have 10°
I am using manifold vacuum so it is added at idle but I havent measured it since putting the new canister on it.
I know it is way more then 3° closer to 10°+

it like less total then gas but bring it in earlier