Long message sorry

Even a shadetree mechanic should be able to guess if you have water in the cylinders, you've at least got a bad headgasket and most likely a warped cylinderhead. Its not rocket science.

Good place to start is an I&T FO-4 manual. Readily available at sponsors of this great N-Board, most tractor parts emporiums, Amazon.com, www.n-news.com also has a great implement archive. Why even Ford/New Holland usually sells it, isn't that amazing? $29 cheap, gettcha 1 and readitt..... ..... respectfully, Dell

So far we've established you are a certified ASE mechanic that hasn't worked on automobiles for 5 years and you can't figgure out to get a 60 yr old tractor designed for horsefarmers to run.

We've also established that you have water in the cylinders and that you have thrown a lot of new parts at your tractor and it still doesn't run.

And we've also established that you took a running tractor into a tractor dealer and paid $470 for unspecified work and now the tractor doesn't run. And you don't know why.

Oh yes, we've also established that you have the I&T FO-4 manual.

What we haven't established is whether you have the triangle, Fuel, Ignition, Compression. We're not off to a good start here are we? Compression, water in cylinders, cylinder headgasket, fix it.
Ignition, does it cough on ether quick start? No?
fix your sparkies
Fuel, does it run on ether quickstart? yes?
its your self-rebuilt carb.

I'm outta ideas..... .....respectfully, Dell

Your mileage may vary

Sounds like you have at least three things going on here.

Water in the cylinders if you replaced the head gasket and did it right leads to the unfortunate conclusion of broken cast. If you are lucky could be the head. Might be worth a compression check to see where the break is. Used blocks are hard to come by so hope that isn't it.

Hope you welded the ring gear to the fly wheel and not the pressure plate. If so at the rpm's these things turn and if you didn't mud dobb it you ought to be all right although I would split the tractor and do it right if it were mine.

Won't start is something else again. If the starter turns it over then start by looking for fire at the plugs. If you have that then pull the carb drain and see if there is gas there. If those both check good and it still won't start then post again.

This was a test right?

Your mileage may vary