A cradle that picks up the rear, side engine mounts and the front mount will do it, however, you will loose the rear mounts when you remove the bellhousing. Then you can make a cradle of 2 X 10's or so to pick up the pan rails, but then you cannot remove the pan. So when you remove the bellhousing and are suspending the engine from the valve cover bolts, etc., find a standard rotating engine mount that is designed for it and pick up some of the rear block bolts that held the bellhousing on. Then you can rotate the engine 360 degrees to work on it. It is best to get one with four wheels, and is long enough for a 6 cyl. engine. Look around for a used one, just make sure it is strong enough.

Ed

'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.