650 or 750 Edelbrock on 340

What was the difference between the auto & 4 speed cam?
276,284 .444, .453. 4spd (1968)
268,276 .429, .444 AT (all other 340)

there is some literature showing slight deviations such as 445/455 and 430/445 but those are the generally accepted numbers. i *believe* they were all ground on a 114*. that was advertised duration and it's acknowledged that they have pretty healthy @ 50 numbers.