Frame Vin decoding

[RPBurris]

So i have long suspected that my 69 K20 was a transplant of a 69 body onto a late 70s frame. I found the VIN stamped on the frame under passenger side of the cab. The VIN stamped is 8 S 308 on top and 11000252 on the bottom. The S is in a circle and probably means the truck was assembled in St. Louis? So what advice can anyone give me when dealing with a 69 body onto a 79 frame? I bought some radiator supports and they do not match what i took off.

I really wish i would have found this site before i bought this truck 5 years ago. It has been a nice truck overall and will be when i am done it just wont be anything close to an original truck. Oh yeah...it started life as a 2wd as well.