if GM told you either of those numbers are for a 55, they're blowin smoke ....
it's a 52 by one number, a 53 by the other, a 55 year old truck with who knows how many previous owners making who knows what changes to keep it on the road, and changing things like the "yellow lights" to keep up with changing DMV regs ....
the fact that you have a different vin number on the title than the one on the door plate is all that would concern me - means either someone has replaced the cab, or someone has found a title of a close year for a lost one, and also means if the man checks the title against the plate you might be in trouble!!
Bill
