Interesting info. Pretty heavy specs, but yet a standard 305. I've never seen one like that. In '63 to '66, somewhere between most and all 4000 and 5000's have the narrow fenders, as well as the Chevy C-50's and C-60's. Have you verified the model size of the truck in your VIN? Also wondering if you have verified the engine size by checking the stamp on the front of the engine.
Bill
