Help me Identify this Plymouth Engine in my Dodge Truck?

[greg g]

there should be a series like IAT, IGS, or similar with some other digits.

[Furylee2]

IGS-4111 is the number on the distributor in my 41 coupe.

[Scruffy49]

1950s 230 cylinder head, I have the same one off a 56 Savoy. Internal bypass water pump. Sideways carb is likely on an industrial use manifold (pump or generator). If your local farm co-op has a parts store they can get everything you could possibly need for a stock overhaul. Tractor Supply has the coil, spark plugs and plug wires. And the 12v voltage regulator...