Camper, as in van front end camper or the big box type camper?
A 77 360 needs a performance cam for sure. A bump in compression would help a bunch too. Just do the basic 360 performance build, the camper 360 should not be anything special.
Lots of stuff may need to be upgraded on your 37 truck as you put the 360 auto in where a flat head 6 with a 3 or 4 speed used to be, or very little is everything has already been done. You may have to upgrade the brakes, the suspension, the rear axle, the wiring, built motor mounts & transmission mounts, shorten the drive shaft, change the tires and wheels, the fuel tank & gas gauge, and a few other items.
Don't give up, its all been done before, we just need to know where you're starting from. Gene