I have a 124 inch wheel base stake rack chevy truck. The id states: one ton, Superior, #1r or TR 1681, engine numbers are: 4 cyl overhead valve exposed with exposed push rods and lifters, Head numbers: P 4-1920, 407-7. Block: H4 P-9 967 422. I think it has a Martin-Perry body and is a 1922-27. Any help?