An update on my project.
I built a hoist between the roof of my chicken coop and some scaffolding and lifted the cab off my existing chassis (it was a mid-engine V8 conversion with an automatic transmission - engine was stuck) and pushed the chassis out of the way underneath, then I set the cab on the flatbed truck and pulled it out of the way, then drove the cab+chassis into a alignment and backed the flatbed back under the hoist, picked it up, drove the flatbed out (while pulling the "new" chassis with running engine into place), lowered the cab and bolted it up. That was yesterday.
Today I was able to finish the linkage and took it for some short drives. SO MUCH FUN! Got a list of tweeks for tomorrow, but running great.