Chilton's, copyright 1973, states "Int .024", Exh .030", goes for all except Z/28 302, 30/30 for both.
AllGo has the right idea. You might search the Class ads, garages, etc. for a junker Holley 3310 to swap the primary block.
Give a man a rescued dog for the health of both their souls. May 2017 ROTM Winner - Thank you!
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CUBS - 2016 World Series Champions - Thank you, Joe Madden … enjoy your next chapter.