Under sized carb for initial start up/break in.

A/A and,
for run in, setting the tune, at or near a single throttle-opening and a very modest rpm range, this is real simple.
With the engine at or near 2000 rpm;
just crank the advance up by ear until the engine slows down, then back it up a lil to find the highest rpm, then return the idle-speed to ~2200, Then set the mixture screws for maximum rpm. Then richen them up hair. Look for leaks, keep the engine cool, and if you have a flat tappet cam, just wait for about 20 minutes.. , while monitoring for leaks, especially for fuel-leaks.
After the break-in, return the engine to idle, set your power-timing, and twiddle the mixture screws as may be required.
Then Roadtest!