360 Magnum vs 340 mild street build - my experience

which engine? The Duster or the Magnum in the truck ?
This is a different 360 magnum I bought for the Duster. The truck has a stock 360 Magnum with a carb. I want to upgrade this new 360 Magnum with a new cam and Aluminum heads on the stock short block. I want as much cam as I can get and still retain my vacuum for power brakes and AC controls.

Cley