GMC's are totally different engines. Check the number stamped next to the distributor- - - -the first 3 numbers are supposed to identify the engine size, such as 228, 248, 270, 302, etc. The GMC engine is about 2" longer than a stovebolt, and it will have insert-type rod bearings, different rods and pistons, and a much more efficient cylinder head design. Don't scrap it out- - -a GMC engine in good shape is worth quite a bit to someone who needs it, especially if it's a 270 or 302.
Jerry
