[vettestr]

Jrr.
I am just a sideline observer and I know nothing about all details but GO with your carb Pro. If he is a GOD or a tweaker is not in question as you already picked him. Too be fair to the tunner he did not select components and can only tune what is there but unless he told you the combination was not tunable before starting it is on him to make right. If you just brought him carb in a box to rebuild then his job is very narrow.
I am not trying to come off as a smart guy or say anything has been done wrong by anybody, maybe I should have simply asked you to give him free hand to make these almost free changes to finish his contracted project. If it is not right it is on him and if you do not let him finish it is on you.

I edited to say BTW> I believe most engines could improve performance with more timing unless already tweaked to find the max for that engine. Cobra29 = You do not need to worry about exceeding 34 degrees from vac advance under high manifold vac condition. 50 degrees total under max vac conditions would be OK as it goes away the moment a load or loss of manifold vac is sensed. The point it drops out is adjustable with aftermarket advance units but most stock vac advance units will work fine if checked.