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Mudshot: Now we're getting into what IH was famous for; suposedly changing parts at model change, when in fact they changed when old supply ran out. The block part number for Farmall A was 6342 DH and the first Super A block was 251069 R1. The real difference in the two being the casting 251069 R1 was made for mounting hydraulic pump directly below mag or distributor and driven off the timing gears. Does your engine block have that provission. If so you can mount a live hydraulic pump. I'm not questioning your opinion that you have an original engine. Is the tractor torque tube flat on top just ahead of battery. That change was made as well, heading into SA production, for mounting the flat bottom touch controll unit. I have seen evidence in the past that some of the last Farmall A were equipped with live factory hydraulics. The book writers and purests will say no. What I would do next is check the casting codes as Andy suggested, every major casting on the tractor has one, about 1/2" high cast in place digits. That will give you casting dates for each of engine, torque tube, transmission, final drives, etc. If those are all within 6 months of each other, you can be quite certain tractor is original. I should have noted last evening the Rx or Rxx became new in the mid 1940s.
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