your going to have to run offset valve guides and .100 offset rockers too. your heads have standard spacing. your only lucky you have 4.125 bore other wise the valve wouldnt clear the head. as you going to have to cut the bowls and loose some compression as well. all in all not worth it. But that me. But if you learn how to do it in class and are good at it Then theres no harm in that.
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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