AD3-152 Engine with AD4-203 Name Plate?

[MF203]

Hello, I am new to the forum and looking for some advise on an old Perkins. I recently picked up a 1965 MF 203 which I am almost positive has the Perkins ad3-152 3 cylinder engine.

When cleaning gunk off the engine I noticed the ad4-203 name place on the intake manifold. It's definitely a 3 cylinder as there is only 3 injectors and I had the valve cover off and there are only 6 rocker arms.

Has anyone ever seen this? Is this maybe a mixup at the factory when the engine was being built? Or maybe someone tried restoring it in the past and could only find the ad4-203 name plate? The only numbers I can find on the block so far is on the left hand side 2324820 C

Just trying to get some clarification before ordering some parts.

See the attached pics, yes I know its very dirty!!

 

[thepumpguysc]

U can call ANY Authorized Perkins dealer & they can tell u EXACTLY what it is aslong as u have that serial #..
THEN u can figure it out from there..

DO NOT scrape the name plates.. get some gasket/paint remover in a spray can.. along w/ a case or 2 of Brake Kleen & go to work..
If u can get the #'s off the name plate on the injection pump, I can tell u what it is..
BUT AGAIN.. DO NOT scrape the name plates.. especially the 1 on the pump..