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earls makes a really neat dead soft aluminum gasket, part number ear-29d03b is a 1.5" round port which fits our D-port head pretty well & also the stock manifold or aftermarket header. they also have graphite around the port. kind of like a LS1 head gasket. perceys also makes a plain dead soft aluminum gasket, i think these are a tad thicker but they don't have the graphite or rings around the ports, there part number is php-66011 for the same 1.5" round port, pt #'s are from summit racing. either one of these blow the standard paper or composite gaskets so far out of the water it's not even funny.
Having owned a number of hot rods, let me save you a ton of trouble. Get some FelPro gaskets, and make sure you go buy a set of header bolts called "Stage 8 Locking Header Bolts". They're about $40, stainless steel, and have a special "D"-shaped washer and C-clip that absolutely prevent the bolts from ever backing out, thus no blown header gaskets. They can be a little bit of a hassle to install, but once they're in, you never have to fool with them again. Check out: http://www.stage8.com/stage_8_1024NET.htm