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Seems you've gotten a lot of advice, some of it "controversial"
I pulled the B20E using a few short lengths of chain, a horseshoe link, a 3-ton chain hoist, and a trolley jack - by myself.
One thing to keep in mind is how these cars were assembled. Unless I've been mis-informed, the engine was attached to the front cross-member and the body was pulled forward and lowered over the motor. If you have the ability, you can remove the engine the same way. Unbolt the crossmember and lift the nose of the car up with a lifting device of some sort.
DO be sure you remove the unnecessary parts - alternator, manifolds, clutch cable, dizzy, wiring harness connectors.
When I've removed and installed engines in my 122s, I use the two topmost bellhousing bolts for one length of chain, and the two bolt holes just above the front motor mount brackets. I've usually removed the valve cover and the rocker and then joined the two lengths together over the approximate center of the engine with the horseshoe link.
This spot seems to be a good "balance" point for lifting the motor. It tips back but that's the goal (to clean the tunnel).
I would not personally lift the motor with the rocker shaft, but I'm not experienced there - it may work perfectly well. My main worry there is that the rocker is only held down with three small bolts and if one breaks you may have some serious issues getting the bolt back out of the head.
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