Ant I stored a 390 AMX motor in the garage on an engine stand for 5 years and the back 2 cylinders where .0013" out. Over time the core moves. Some of the best engine builders don't have engine stand that work off the bellhousing end in their shops. Rotators bolted to the motor mount pads. I have engine roller stands that the motor sits on the
oil pan rails all the way around.
As for preoiling, get a 2 quart accusump and hook it up if you can't reach the front of the dry sump. I know it's done with heaters for
oil tanks but what if any down side for putting warm to hot
oil on outside temp parts?? years ago we had problems of adding room temp oil to hot motors and got piston and rod knocking from bottom end. Thermo shock to the bearings or crankshaft. Rick L.