Engine on stand starting question

You can start it on the ground with a trans on it. It won't tip over. No need to sit on it and burn your boots, or worse. Put a block of wood under each side engine mount

You will need a radiator so you can run. It and break in the camshaft.

All this talk of making something to start it from the front, you will waste a lot of time and maybe end up in the ER. Just bolt an automatic trans to it and loop the cooler lines to each other.
That takes all the fun out of it in the junk yard years ago. There is nothing like riding the trans reaching over to rev the engine.

Watch out for the rear distributors. The wires back then would juice you up and throw you off like a bull. An old 354 Hemi got me when I was younger. Try picking one of them up from its side.

I can remember my dad asking us who's getting on. We would draw straws for the big Cu.In. engines with AC and Power steering. Fluid squirting in the air from the trans lines and power steering. And the fan throwing up a dust storm. A life experience all should have. Those were the days.