trans and cam help

[Morgan72]

Hello all,
first a description of my ride.
1972 GMC c15 a/c cab 350 with a 350th auto trans single track rear axle, all stock.

what i am doing.
first the rear end is now a posi 373 gearset.
want to use a 700r4 trans.
want to use new roller cam with a nice lope to it.

so what info i need to know is...

with the 700r4 i know some were modulated overdrive and some were electronically locked in overdrive.

What type should i use?
are there certain years i should look for?
any other info that would be helpful to selecting the right one for my project?

and for the cam.

what should i get?

want a roller rocker set up, and everything else remains stock...stock ram horns, edelbrock 600 carb, stock fuel pump.

any help would be greatly appreciated.

have a good one and thanks
shaun