[TimT]

Use the insulator blocks between the head and manifold. I have run a Weber carbed 911 like this for years.. also the dia of the manifold is different top and bottom.. the insulators only fit on the bottom... unless you have some special one off insulators.

Also have had plastic and metal stacks.. either work, prefer metal..( broke a plastic stack once)

Skip your PMO dist and call PMO direct. they have tall manifolds, I currently have a set on each of my cars.

Oops if the host is your PMO dist tell them that PMO does in fact sell tall manifolds.