This is the rig I use. The two bolts with spacers (1/2-inch sockets) go in two of the head bolt holes hearest the manifolds and the other two bolts go in holes on the distributor side. I bought the leveler from Eastwood, but any good leveler should work.

http://s858.photobucket.com/albums/ab147/jdaniel171/?action=view&current=P1010151-1.jpg

Joe D.