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between my tired old eyes and the size of the picture I do not see a heater hose on the front of the motor.
when you say motor do you mean the intake manifold or the water pump?
can you provide the engine code located on the front right of the engine?
Doug is correct, some one had added a heater hose to the port that normally has the coolant temp sensor, or the thermostatic vacuum T installed on it. Mu guess is when the heads were rebuilt the shop installed plugs in all 4 of the spots that the heater hose nipple is usually installed in 1 of the 4. Still no help with the exact engine ID with out more and better pictures, along with the block & head codes.