The truck has a derrick mounted on the back of the truck, so it will constantly be hauling some weight. I also intend to tow a large trailer with a backhoe on it, combined weight of about 20,000lbs (10k for truck, 10k for trailer). I guessed the hydrovac would be sufficient, but with that much weight behind it, I thought splitting the system would be a good idea.

I see a lot of parts numbers out there, is there any specific number for a 1964 chevrolet c6303? Or can I just stroll into NAPA and say I need a brake booster?