Planning first engine build, need help

Job #1; check the float levels, #2; choke operation, if You actually have 15deg initial #3; verify the mechanical advance is doin' it's thing. IIRC, l had to limit the mech adv on Mine w/only 12deg initial, should have 30-32deg w/o any vacuum to the dizzy total. How close is the air cleaner lid to carb..? Etc. Believe Me, just being rebuilt assures nothing on a carb, especially if it's sat around. Just handling it can screw the levels up, insects/spiders, etc, can plug tiny passages.. tiny air-bleeds...