I will take a stab in the dark and say Dodge? start here... you'll find it. http://www.dodgepowerwagon.com/main/links.html
you didn't say what vehicle the vin# is for, need more info. car,truck,... engine block numbers can sometimes narrow things down.
I think it is a 1946 Dodge WFA-32 with the number of 88503988, i want to know what the size of the engine is and to find parts for it?
check out this site www.powerwagon advertisers.com a picture and some numbers and these guys would know.
Serial numbers on older vehicles very rarely include engines used. Usually it will just tell the year, model, assembly plant and production sequence. In this case, I don't think it even gives you that. I can say that it was build it Detroit.
There's very little chance it's the original engine, the only way to know what you have is to pull the head. There should, however, be a milled flat spot on the front vertical side of the block with the cubic inch displacement stamped in. This tells you what it WAS, but many rebuilders hogged out worn cores to bigger sizes without indicating what they'd done.