I'm looking to order some roller rockers and a zz4 cam. Should I got with 1.6 or 1.52 rockers? Also, to change the cam, cam I just remove the rockers, rods, and intake manifold to change it? Or do the heads need to be completely removed? Is there anything else I should change with the camshaft like bearings or anything else? Motor is a 350 TPI.

 

To change the cam you'll need to take off the valve covers, intake, pushrods, lifters, drive belt(s), accessories, water pump, balancer, oil pan, timing cover, timing chain, radiator, A/C condensor, and probably a couple of other things I've forgotten.

The block has to be out of the car to change the cam bearings, so as long as they look good you might want to skip that.

 

ZZ4 cam specs:
Duration @ .050 Lift
Intake 208 .474
Exhaust 221 .510


the ZZ4 is too big for stock heads. You'll need to modify them.