Here's the parts manual/catalog, engine mounting is covered in first few pages of the engine section
http://chevy.oldcarmanualproject.com/parts/1929_54/index.htm

Oops, that's the Chevy parts catalog, but should be same or similar enough for the GMC engine mounting.

Last edited by Grigg; 01/16/2018 3:04 PM.

•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-