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.
You can bolt or lag to the blocks & one under trans mount, too. Mount all on a pallet if you have one.
Ran them on pallet with ratchet straps on them, too. Starter switch hanging etc.
Made a big cardboard box work to run a Continental air-cooled 6 cyl tank engine inside to cool properly .
Made cardboard dash for gauges & switch.
Still have everything in a box to run engines, weighted fuel hose w/filter, batt cables & rudimentary wiring harness, direct reading thermometer gauge(FSN new old stock)screw in, oil pressure gauge, electric fuel pump, & more.