I have a 2 bolt block 454, it has "hi performance pass." stamped on back of it,i pretty sure it's usable,also have crank for it but it rusted and probly have to be turned I can get pic's thia weekend if interested,Open to offers/trades for anything gmc.let me know,thanks, conoverbandit
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71 GMC 3/4 ton converted to dually
75 chevy swb 4x4
78 pontiac trans-am----sold, so long old friend.....
87 Crew Cab 2x 454
93 chevy hi top conversion
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