Be advised my crank pulley was different( on my stock 67 440) than any other newer pulley. the measurement from flat surface, that mounts to the crank damper, to the belt groove was 1/8" inch different..
My crank pulley was bad ( too rusted to reuse) and I was in a scramble trying to find another.. I was VERY lucky that Randy ( 1wildRT) knew what I was talking about and had one he sent me..

Darn I miss him... Anyways you have been warned...