Thanks Chris, I will get in touch with Blane and I'll let you know what he says about his filter. Yes, I thought the tractor looked pretty straight as well. Hoping to go check it out soon and hopefully strike up a deal for it.
 
I think your right about it having a cab originally. The owner told me the fenders dont fit quite right and are tipped up at the front a bit and the tops do not sit level, or parallel with the hood. Makes me think those fenders are not originals. 

Dan