750 Holley electric choke question

The choke fully closed need not be fully closed. The rebuild manual may give you a 1/32 gap or a drill bit size that will fit between the choke and the horn. Set it at 90 degrees off and let it close where it may. Iirc you can rotate the heater a little to manipulate the "global" rotation clocking. The choke pull off will also pull the choke open a little on full throttle.