rebuilding a rebuilt slant

Ok so I did some looking Clifford has a few cams 2 of which they say are for manual trans. only... I spoke with a guy from Clifford and he said that with the bigger cams the motor wouldn't create enough vacuum to shift the trans....Is this right? I don’t remember any vacuum lines going to the trans. Any thoughts?

Danger, Will Robinson, Danger.
Stay away from Clifford for cams. Larry doesn't know what he is talking about. There is no vacuum on a Mopar auto trans. Clifford has sold Hydroulic lifter cams and lifters, for solid lifter motors, and there is no way to get oil to the lifters, with adj rockers and pushrods. There are much better places to get slant six cams.

PS: You can swap from hydro to solid, or solid to hydro, IF you use the complete valve train assy as a set. Cam lifters, pushrods, rockers, and shaft.