Gear Drive: Pontiac V8 64-79This is the Edelbrock "Accu Gear Drive" system.. for Pontiac V8 from 1955 thru to 79.. but NOT the 301 Pontiac V8 carby OR Turbo series. Fits: 350, 455, 265, 400, 287, 389, 428, 326, 421, 347. Edelbrock Accu Drive timing gear drives won't stretch or wear out, the way timing chains will. They provide up to eight degrees of cam timing adjustment in two degree increments and have offset bushings for easy cam indexing, as well as SAE 8620 steel gears that