Small block and 727 Install

Unbolt the trans crossmember, drop the engine/transmission in as a unit at an angle. Put your floor jack under the trans pan with a block of wood, jack up the transmission to allow you to put the crossmember back in, line up the mounts and bolt it in. I have done many this way.
Me too, I never saw the need to do it any other way. I've installed many this way by myself with the help of a 6' cheater bar.