Hi mate,
The others have given you some good info, but i thought i would add abit.
The head is late ww2/post war- there is quite a detailed evolution of the head markings relating to both Willys and Ford heads- with as is often stated on g503.com, WILLYS JEEP on the head is late war (1944/1945)- casting date is needed to be certain of the heads date! Check this site for info on heads!!!
http://ww2jeeps.com/htm/heads.htm truncate it to
http://ww2jeeps.com for more info on jeeps. A side note about CJ engines- they tended to be a popular choice due to the gear driven cam as well as availability as a new motor when about people were looking to re do their jeeps, however we are fortunate here in australia that there werent many CJ's to ad to the confusion of parts! Alot of parts on jeeps in Oz, are ww2 or made for the ww2 jeep, not made for a civilian equivalent vehicle and added later- dodgy repro parts from the last 30>40 years are a different kettle of fish!
Did you know on a Ford GPW from factory the engine and chassis number should match (also match the dataplate on dash). As such, the engine of this jeep is approx early april 1942 (its very close to my GPW 11730!). One other easy one about chassis serials, Willys MB's start with 100001, GPW start at #1.
It does have a GPW style body though- note the rectangular depressions around the tool box locks (your MB would have round ones). These rectangles are unique to only ford made bodies. Willys had round, then sometime in early 1944 from memory, a composite body was produced using willys and ford design which has round depressions, but other ford features. So, there are ford bodies (with many different features for early and late!), ACM 1 (American Central Manufacturing) bodies used by willys and ACM 2 composite bodies used by both. To throw a spanner, ford used ACM 1 tubs and other main panels with their own ford bolt on bits in late 43>early 44, so you may find a GPW like this around (there are a few) which can be a curve ball!
At a guess, this jeep has been through a rebuild at some stage or rebuilt using different bits during resto. I cant see enough details of things like dash and running gear to give more educated guess. The repro plates probably could be the current number of the chassis, but it isnt exact for June 1942 as per the add, or october 42 as per the plate- it should be around april/may 1943- GPW 112189 is here in Australia- in NSW (
http://www.g503.com/serial-numbers/v...?record_id=680). I would guess though that the chassis is original to the body (ford chassis and ford body match the ford serial number). We did also get alot of rebuilt early jeeps which had been used by the US forces stateside during and post ww2, so it might be one of these, it might not (probably not).
I suggest you ask for All American Wonder Volumes 1 and 2 (vol 3 isnt as good) for christmas as they will answer ALOT of questions and make you a more knowledgable jeeper! There are many other good books like Standardised war time jeep 1 and 2 by John Farley (dated pics showing changes!), Jeep Jeep Jeep, Ren Berniers guide to ww2 jeeps etc etc which would also make good stocking stuffers! Of course, as stated
www.g503.com is a good place to check out for jeep related things too!
Hope this helps,
Ian.