Bill I think it would cost alot of money to switch a small block car over to a big block car, especially when you add up all the little stuff like headers, tranny case, converter, maybe radiator??

But if you really want to do it you could build a mild pump gas 451 low deck or 470 with CNC Eddy heads, or Victors, with a matching solid or roller cam and run 9.50's-9.80's in your car all day. My old DartSport as Sport440 mentioned went 9.77 at Norwalk last September.
Or you could just buy my purple 69' and run those numbers on pump gas at 3200 pounds.