Father-Son 1974 Duster Project

Looking good!

Sometimes I feel like an *** due to my lack of Auto Mechanic knowledge, and It is compounded by the time that has passed since I disassembled most of the car.

:banghead:

Today's riddles include, what thread size are the u-nuts and bolts that fasten the dash frame to the back side of the cowl and what size is the appropriate vacuum tubing for my heat/ac set up? Where does the main vacuum line come through the firewall? And were can I get a schematic of the vacuum plumbing? I did a search for the latter and couldn't locate one....