My brothers got a to20 and is tired of not having lift control. I have a single clutch to35 with a hole in the block. Will his motor fit my 35 bellhousing or should he go with the zang thing?

I've copied the instructions and printed for him. It does look to be simple to fab. THANKS.

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Zang is apparently no longer making the "Zang Thang", but I recently built one myself using the instructions from

http://fergusontractors.org/nfs/wp-content/uploads/technical-articles/Position-Control-for-20-30.pdf

Much easier than doing an engine swap, IMO; only took a few hours to fabricate and install it. I don't have a lot of hours on it yet, but in initial tests with a blade and a 5' brush hog, it seems to work very well, exactly as I had hoped.
Very intuitive in operation; if you want the implement higher, you just pull on the handle and let go when it gets to the height you want. To lower, push on the handle then let go. For small movements, just bump the handle.

I bought a length of 2x3 tubing on Amazon, and cut all the flat pieces out of it.

https://www.amazon.com/gp/product/B003TPFLVG/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

I had a length of 5/16" rod laying around, but it's readily available at any hardware store. Held in a vise and heated with a propane torch to make the bends.

The square holes aren't really necessary. The large one just makes it more convenient to adjust the spring tension, but you can use a hex bolt and wrench just as well. The smaller one is for a stop to save a position, but I didn't make that piece (yet).

Didn't have any suitable cork on hand, so I used some very fine (1200 grit) sandpaper instead. It may wear out quicker than cork, but seems to do fine for the moment.

Sorry, no photos yet, and I won't be back to where the tractor is until next spring.

Look for another good 35 Deluxe and buy it. May be as cheap as fixing either of the two tractors.

Motor will not bolt up - This was posted here recently in reply to a question about lift control - http://www.fergy.com.au/positioncontrol.htm - the US ferguson site has instructions for DIY - I've seen other posts here over the years about it, an advanced search of this site should turn up information -