Al, Bob Huntress and I are all on pretty much the same page.
Whether you choose to do as I did, blasting before any disassembly for mechanical work, knowing that I would have every piece of that tractor apart and cleaned/fixed/replaced, before putting it back together, or go as Al describes and disassemble first, then clean (blast if necessary and then reclean) every part or assembly, you will wind up with a clean tractor. It will depend on what mechanical work you plan on/the tractor needs.
Your shop can blast or otherwise clean it up as a whole or in sections as they tear it down but, as Bob points out, grit from blasting with abrasives after reassembly will most assuredly get into something, and you don't want to ruin good work.
Just as a quick example, I helped a fellow with the clutch on an M that he had paid for as having been restored. Crawling and groping around up in the belly of the tractor to get at the clutch, I found everything covered with a fine grit. I couldn't decide if it was broken sand or glass bead, but it was on everything up in there. Best guess is that it got in around the piping for the hydraulics where it passed thorugh from the belly pump to the outside. It wasn't pretty in there.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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