That's a long way for a piece of cast iron to bend. You're inviting a leak or a crack unless you get it milled. How about the intake? It's usually a good idea to leave the bolts where the intake/exhaust manifolds meet slightly loose until the whole assembly is snugged against the head a little.
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!