We exclusively use Payen brand head gasket sets on the engines we build in our shop upto a 3.00" bore (+0.060).   This head gasket set is for the flat deck blocks found on 1968-1971 cars, due to engine swaps, check your block before ordering.
Payen's head gasket material is excellent, and comes with a rolled on sealing coating that also enhances gasket grip.
September 2016: Please note that Payen has decided to no longer include the trianglur metal clad exhaust manifold outlet gasket in this gasket set.  Apparently those few extra pennies cut into Payen's profit margins too much to continue offering that gasket in the set.  We will update our product photo in the future.