I am not an expert but as other have stated you can make plenty of power with a 4.25" stroker kit. I would save the 4.75 crank for the aftermarket blocks. I would hate to see a broken block over this. Good luck to you.
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Conrad
79 Trans AM 406 #12 heads Torker II intake Crower 60210 750 holley vac. sec. T400 3500 Stall 3:73:1 rear.  ECMTTFMFers. IHTTFMFers.
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