you are doin the proper head work to run unleaded right? 11.5 on a cast head you are asking for a hole in a piston. 100 octane Might solve it lead additive is an option or get aluminum heads? and pain them to "look" correct but save all the original pieces?
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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