Distributor hose routing help

Mattax said

On this page, from '73 MTSC, it just shows the OSAC as an in-line valve. Maybe that's what your car has/had. It would explain no tee and also only one connection on the vac canister.
1973 Imperial and Chrysler Clean Air System Reference Service Repair Book from the Master Technician's Service Conference (Session 302)

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If you need a new canister, you can (a) see what the vacuum timing specs are in the shop manual. (b) open the distributor and see if the arm is stamped with a number. That only gives the total advance possible but its better than nothing. Then see what's available new and from old stock.