Charlie one of the misconceptions about MII front ends is the weight of the car. A Mustang II was in the 3200 lb range, the engine set square over the front axle center line, both 4s, V6s and V8s. The diameter of the caliper puck is the same as the full sized GM calipers that were/are used on many after market kits. My 36 Chevy with a 351C/FMX weighs in at 3280 with a half tank of gas, the engine sits behind the axle center line. My 48 F1 came in right at 3000 lbs. Mustang II will hold up very well in most earlier cars, better I would guess because earlier cars that are modified and "fixed up" don't get the same abuse as a stock dailey driver would.