Please show us a picture of where the clearance problem is. I think the 4737 carburetor is the original carb on a 1970 440 with a 4-speed, so it "should" fit....but apparently isn't.

70 Roadrunner convt. street car 440+6, NOS, 4-spd, SS springs '96 Mustang GT convt. street car '04 4.6 SOHC, NOS, auto, lowered "Officer, that button is for short on-ramps"