WC 52 What engine do I have?

Hi everybody, this is my first time around here. I'm restoring a WC 52 I bought from a gentleman in California and it's pretty much my first dive into the mechanical world. I know almost nothing about the truck other than it's a 1942 build (still has small diameter diff in front), it has a Navy ID plate on it, it has had a Marine paint job at one point, and it was used and abused as a logging truck for many years. It came to me with problems with its fuel system, exhaust system, and non-functional hydraulic brakes. I've been rebuilding it slowly under the assumption the engine was original but I made a discovery tonight that now makes me think I'm wrong about that. After having issues with her first start up test I've been examining the engine closely and I sound the serial number on the engine might from a later Dodge.

Can anyone help me identify what I have here? The engine serial number reads: D34-I94924 (I think). I'll include some photos below. Any help would be very much appreciated! Thanks!

Engine Serial Number:


Body Tag


The whole thing

Take a look here.

http://www.t137.com/registry/help/otherengines/dengines.html

Frank

Well its a great looking wc52 so keep up the good work. Also try g503 website there a lot of ww2 mv folks over there too. I have found a lot of ww2 parts on both these websites. I got three halftracks and other ww2 vehicles and stuff.