I don't think you can drop the crank with TC since the rear seal carrier has bolts into the block which you can only remove with the flex plate out of the way. This is my first thought - remove the cams and oil pan then remove the main caps. That might loosen the crank enough to turn. If not, remove the rod caps, send penetrating oil down the cylinder walls then hammer on a pipe around the rod bolts to send the pistons to TDC (that's why you removed the cams). That should be enough to turn the crank.

Hey, it just occurred to me that you might be able to use the M104 oil pick-up tube in your 602!

Sixto
87 300D