Carburetor settings?

[yellow heap]

My 383 is close to yours but a bit more cam
It likes 16 in 34 total at 3000,so I think your is fine.
The vac advance will help you run a leaner idle.
A good tach and vacuum gauge are great to set idle.I keep the rpm constant(say 750 or so) and as I'm moving the idle metering screws I keep the speed the same with the throttle screw while looking for the highest vac reading-at that point I turn each idle mixture screw 1/16-1/8 turn rich to aid drivability.
You will have to be carefull on the vacuum advance with your comp and iron heads,Iwould guess no more than 10-12 dedrees is all your motor would take
for a total of 46-48.
Nice lookin nova by the way.