I've used a Blockmaster mill to face off the intake and exhaust manifolds together after getting them as close as possible to aligned using the "no gasket/bolt on" method. It usually only takes a few thousandths of milling to get a perfect fit.
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!