On Thu, 15 Jul 2010 15:18:14 -0400, John H
wrote:

When I did mine, I rigged some twine so I could take the weight of the manifold
around my neck. This left hands free to get it centered, get nuts started, etc.

There's a better way. Buy two threaded studs or create your own by
cutting off the heads of a couple of bolts. Screw them into the
block temporarily so you can hang the new manifold on them while you
start the remaining bolts.