Here's a tip, having done it myself:

remove the tranny!

Only 4 bolts + ground strap in the back mount and 6 each on the CV's, 2 on
the clutch, not much extra work.  Then, you  have the opportunity to clean
and inspect the tranny, change fluids, and add extra lube in the ends of the
CV joints.  Now, you can easily bolt everything together without laying on
the driveway, just like they do it in the factory.  Then slide the whole
assembly under the van and use the back tranny mount to locate the assembly
in the right position.  Put the 4 bolts in loosely, and you only have to jack
up the engine into the bay.  No balancing, or pushing around trying to line
up everything, or fussing with everything.  Piece of cake.  Another tip: put
plastic bags over the ends of the CV joints - it keeps grease off your
clothes, face, hair, etc.  Have fun!

Bill Marshall
85 GL Tiico
Phoenix AZ