cam question

The 72 and 73 specs were similiar, however there is a difference between some of the cams used behind a standard tranny and an auto - which do you have? In 68 there was a hotter can in the 4 speed engines, and after 1970 there was a drop in compression and I believe cam specs. Do you know what you have in there for rear end gears, because that will make a difference to how much cam you can handle.