Looks like a factory H-M truck to me. Someone has added turn signals but the floor and start switch appear factory. 54 was first year for Chevy to have H-M in half ton trucks. GMC had them in 53. If complete, a good deal to build. Chevy and GMC used different linkage as well as shifters so parts will not really interchange. If trans is healthy, they are pretty bulletproof. They shift and operate different than a modern automatic but still a very neat piece.
