For a 350 with the 700R4 trans, I would use two wooden crates that you can pick up for free at your GM dealer.These are the kind that a "crate motor" is shipped on.I have put some cheap casters on them to roll the engine around the shop.I have a Blue Point(Snap On) brand engine stand that I also use.
When I built aircraft engines, we used a pipe in the floor with a flange to bolt the crankshaft to(prop end down).You would build the engines from the crank out then level them off when you were done.


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