I would recurve the distributor so it has between 32 to 34 max advance after 2400 RPM and set it up so it has between 12 and 18 degrees before top dead center at idle, under 1400 RPM.
Is this a iron head motor or aluminum head motor?
If iron heads be very careful on the spark plug heat range if it has a true compression ratio 10.2 to 1.
I would run the stock Champion plugs for it which I think was RN9YC, not any hotter
On the Autolite brand I would try their 3923 or maybe the next colder 3922 if the 3923 run to hot