try dick miller racing 662-233-2301 reading an ad about an offset ground 455 crank in a 425 olds that uses 7.0 inch bbc rods 10.33:1CR 230/236 at 0.050 0.522/0.522 cam 30 over 488CID made over 500HP and 600FTLBS.Sorry i'm not an engine builder.PS nice ride! tired of seeing nova's.