That reminds me of a 351 a friend and I put together years ago. He bought file fit rings and we bought one of those tools. Trying to figure out how much pressure to apply while filing. Well all I have to say is take your time because when we got impatient about how long it took to do one we spun it a little too fast with too much pressure and then, yeah, gap too big. Right in the garbage and no extras. 
I think you said you're a machinist so you should have plenty of patience.
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(2) Original, 100, 102, 124, 73, 800, #1 and #2 cart, brinly plows, disk, IH184, IH244, 1948 F Cub
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