Nice start you have there.
I don't think it's a 37 though.... 34-36 they made that style. I could be wrong but I spent a lot of time looking at them when I picked up mine. Was there wood door innards? Is the back of the cab made of 3 pieces? If so it's probably 34 or 35. I believe mine is a 1936 since it had 1 piece all steel doors and a one piece rear cab + I somewhat deciphered the chassis ID tag. I have known of some folks that refer to some as 36.5's.
I will watch this build... we are going to have to change the name of this site to IH rods rule!