Some tuning questions

[dad's deuce roadster]

Guys, the status or our work to bring our father's 32 Roadster hot rod back to life is that it is now mechanically all there. The latest items being a real exhaust system and proper plug wires, i.e. solid core which the coil can now provide sufficient spark through vs the carbon that we used in our teens not knowing there was any difference in wires. Also, we added a pressure regulator to get pressure down to about 1.5 psi for the Strombergs. The engine is running nicely but rich. This brings me to a few questions.

First, the engine is a 59A, likely 1939, stock crank, bored 0.040", dual vintage stromberg 97's on a Navarro intake, Sharp heads, crab style distributor.

Question one, what is the best way to set the timing?

Question two, the engine is running rich - looking at setting the idle mixture, it seems it's pretty similar to, forgive me, tuning the Q-jet on my Vette, start at 1.5 turns in, then make 1/4 turns on each in or out as needed until peak RPM is found. Is that correct and is there anything more to it?

Question three - if we need to swap jets, what would be a typical for size for the the engine set up.

Thanks,