Sorry for the confusion. Yes, the AAF481402 is whats stamped on the engine block. The VIN plate is 5AN018297, the plate looks like it may be not original. Title has the 5AN018297 on it.
1946 GMC 1 Ton 1984 GMC 1/2 Ton 1996 Dodge 1/2 Ton 2014 Chevy 1/2 Ton 2020 Ram 1 Ton Cummins