Stranger,
Red has, as usual, given you the useful information.
I hope you do not mind me adding the following information (even if it is repetitive):
If that frame code (255K013245) was taken from the original Vehicle Serial Number (VSN), it would be the code from a 2nd series 1955 truck assembled in Kansas City. In 1955, in USA trucks with regular cabs, the VSN code would have been on the plate that was on the door pillar. There would also have been a prefix letter that indicated the truck series/model.
Here is a link the Specifications Manual that can be obtained from the GM Heritage website (it is a large download).
234 G is the paint code for Empire Blue (with Bombay Ivory wheel stripe)
I cannot find a 767 code, but if that code is 267, it is a rear spring option number (it might be another paint code as Bill posted, but I cannot find it in the Specifications Manual or in the Truck Data Book).
