bill did you have to do any body work to get the 6V-53 to fit in your '67 GMC? or did it fit with different mounts?
The previous owner put the engine in a year or two before I bought it, but as I recall, he did tell me that he had to use all the body mounts from the truck he got the engine from as the cab needed to be raised up some. I would say that the engine mounts also came from the other truck. The 6V-53 was factory available then, therefore it should all be a bolt-in deal.
Bill
