Can you post pictures and ID info of the existing brake booster and master cylinder? I've got an original 1968 Chevy Truck Chassis Overhaul Manual that has the diagrams (cut-away assembled and exploded disassembled views) along with the instructions for the overhaul process. I'd be glad to snap pictures of the correct brake booster/master cylinder info from the book and post them here, once I can confirm which one you have.
