Is there a source for carter fuel pump part/ engineering numbers. Looking for the correct pump for a 66 390S code.
Yes the Master Parts Catalog (MPC) that covers that year
Fuel pump would depend on the car model that the engine was installed in. Don't have Merc MPC but Ford shows four different versions based on body type (doesn't identify 2v or 4v)
Best guess I can provide without any additional info would be the following that is listed as being used on Mustangs and Cougars in 67 (under the GT identifier) as well as some 66 Fairlanes and big 66 Fords. The latter with 352 & 390
Part number - C6AZ-9350-B
Carter part number and stamped on mounting flange side - 4194-S