Herb:
Is this a 2 wheel drive or 4 x 4 ? I ran a 500 hp 454 in my 4 x 4 Blazer and broke 3 -12 bolts (big tires-373 posi). Finally put a 14 bolt corporate (410) under it and never had another problem with rearends. But then I had to deal with 8 lugs. Incidentally the car 12 bolt ring & pinion is the same size as the truck 12 bolt ring & pinion. (but I do not know if they will interchange).
 
                                                    Larry (Z)

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