Can I ask for a favor? Would love to see the front undercarriage of your car near and below the engine. Can you upload a few more pictures?
Finish of the bottom side of the front frame rails and such (firewall forward) would look very similar to a 66 San Jose car. Red oxide epoxy primer sealer with direct and over spray of black from the engine compartment, radiator support, front and rear surfaces of the frame rail and inner fender panel (wheel side) application of that black. So pockets would have more of the red oxide color than other surfaces that would have been exposed to the spray gun as it painted other surfaces in line with those panels. There were variables since not all painters were the same height, bent over as much or put in as much effort in every case.
Should be able to find some San Jose examples in the threads
