My dad just bought a John Deere and he gave me his old IH. The serial plate is scratched beyond recognition. The only thing I could make out was 9374J. It's been painted by the previous owner and I have no idea where to look for identifying markers. It has a C135 engine. I took from that, that it should be a 330, 340, or 404. Is that correct? Is there any way of telling what I have? Thanks for any information!