I would say keep the 400, the long stroke over the 383 will develop more low end torque that will help move your chevelle(bit heavier than a camaro/nova). I would say rebuild it as a low compression blower motor and add a D1SC to make a motor putting out 800+ horsepower that is pump gas compatible.
EDIT: 383s and 400s have the same stroke, I must have been thinking of a 377. Either way I still say the 400 is a better choice.
Last edited by D Rock; 12-29-2005 at 07:51 AM.
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