My own build thread is quite old, bad picture links... this project has taken a long time and then life got in the way, so still not done. https://www.stovebolt.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=752661&page=1

Here are a fair amount of pictures of my project. https://picasaweb.google.com/118082...ictures02?authuser=0&feat=directlink
I did have to modify the firewall, mostly widen the indentation to fit around the wide Detroit cylinder head. Also needed to make a little room over the flywheel housing so later the transmission can be removed without removing the cab. Aditionally I used a 3" body lift.
The radiator is in stock location (except 3" higher). Inner fenders may or may not need trimming, not sure yet.

The GMC turns out to be a little easier to swap because more room between radiator and cab.
Here are some pictures of a friend's truck that I was able to start the conversion on. Also turned out the GMC front engine mount crossmember if holes are enlarged from oval to round fit perfectly with the Detroit 4-53 front engine mount from GM truck like yours and positions the engine well in the available space.
https://picasaweb.google.com/118082...dranger02?authuser=0&feat=directlink

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-