Be sure to check the torque on the manifold to head bolts frequently, and use hardened steel "SAE" flat washers between the bolt heads and the manifold. Anti seize compound on the bolt threads is also a good idea. The different expansion rates between the aluminum manifold and the steel bolts has a tendency to compress the gaskets and create vacuum leaks.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!