I know not C body but some you have experience with B bodies and are very knowledgeable on Bs as well.
Looking for some 70 Plymouth Air Grabber parts such as the following:
Firewall grommet with three holes for the hoses
Trico vacuum canister with 2 same size little inlets and bracket and screws
Under dash vacuum solenoid with green wire
Metal bracket that holds the molded hose connector to the switch. It’s a C shaped metal clip with 2 prongs
The hoses
A rust free hood would be...
Wanted - 70 Air Grabber parts