My FIL bought an International Industrial broom tractor for 1500.00, no PTO, no lower arms for the 3ph, but the upper arms were there. He drove it home 4 miles and discovered oil running out of the exhaust. Engine needed rebuilding, said he knew that when he bought it. The broom worked but he has no need for the broom.
He rebuilt the motor in his shop for 500.00 plus parts, hired a buddy mechanic to do the work.
I installed the lower arms, chains, leveling box links, got the 3ph working great. Parts were 175.00 about 5 yrs ago. We looked at several salvage yards to get the PTO parts and IF he could find them on the internet in some other salvage yard, they were going to cost 4500.00 for used parts. When I asked about new, he said we didn't even want to hear that price. FIL said he wasn't investing 4500.00 in parts.
His main use for a tractor is for bush hogging and driveway maintenance. He has about 3500.00 total out of pocket spent on a tractor that has no PTO. He could have bought a good used Ferguson To 35 or a MF 135 for about that price range and it would have done everything he needed to do. He didn't research it properly before he invested in it by buying the project.
The cheapest way is not necessarily the cheapest way. Farm type tractor parts usually are NOT intercangeable with Industrial type tractors according to my salvage yard dealer. Finding another tractor that will interchange with his sitting somewhere will be almost impossible.
Now for the icing on the cake. 2 weeks ago his grandson was pulling up stumps and brush with a sub soiler attached by the 3ph. He spun a bearing on the crankshaft, (they think). Anyway, lots of money spent, no tractor to do the work.
Call a salvage yard and price the parts to convert it BEFORE you start bidding. Or buy it with the idea of fixing it and trading it off to someone needing a loader tractor. In my opinion, converting will be way too expensive.