I like the big Cadillac and thought about putting one in my Suburban.
My Suburban is a '55 1st GMC. The next model GMC's were available with Pontiac V-8s.
I've often thought it would be fun to install a Pontiac 455 with valve covers with GMC stamped in them. And then I'd tell everyone it was the original motor.
But I've since learned that the valve covers had decals, not embossed logos, so it wouldn't be near as interesting.
I found a good deal, so I bought a 454 and will probably put that in. Someday...