These questions really belong in the General truck forum or maybe the Paint and Body forum.
..........to answer the question we need to know if you have any numbers. From the cowl tag, which on a 37 pickup is on the passenger side of the cowl.....or numbers from the title or engine if original. With numbers we have guys here who can decipher them.
......so, let move to the General truck site, or I'll edit it and move it there. Just trying to help.