To De-Smog or not to De-Smog...

Done correctly you can pull most of that stuff. Just don't start jerking stuff though, the car will more than likely have to be re-tuned to compensate for the changes.
Optimum end result would be hose for the PCV, line for the vacuum advance, and whatever your heater and AC requires.

Don't throw the smog stuff out though, all to often there is some bureaucrat that tries to reintroduce the Pre '76 cars back into the smog program. So far we've defeated them, but you can never tell what may happen.