On the other hand, I think the NAA used about the same transmission and rear end as the 8N, and a BUNCH of N"s were repowered with Ford flathead V8"s, flathead 6"s and even OHV 6"s, and probably other engines. Maybe the repowered tractors owners had to be a little careful with putting on the power too hard and too fast, but I have not heard of a lot troubles with the MUCH more powerful engines tearing up the transmissions and rear ends of the modified tractors.
So if the owner of the NAA can come up with a good 172 engine, I would suggest using that. It should bolt up just fine and unless he really abuses the creation, he will probably never have any unusual problems with it.
However, some people are really concerned with something being "correct" and to do that he would need to find a block or engine with the proper casting number to "restore" the tractor. If not, your good 134 would also maybe be a good choice to get it going, if the price is right and it is close enough that the shipping would not make that cost be unreasonable. Good luck to both of you!
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