You have a 1954 truck that is 59 years old and has been modified to keep it going with parts from other trucks. As I stated the radiator is from a GMC. It is not sitting correctly in the frame, thus the wood blocks and long bolts. It is easy to imagine someone modifying the core support for a single bolt if the others were removed or broken. The proper set-up for your truck should have one bolt on the left side and one on the right. Are those original supports still under the radiator?
