How fast are big block Duster's.

I have a 70 Gold Duster. 440, aluminum heads, intake, water pump housing and radiator, a very heavy A-518 overdrive trans, a somewhat heavy Strange nine inch axle, steel wheels and nothing else done to lighten it, the car weighs 3330 with out me in it. Its 3500# race ready. It had a little over 500 hp with the tiny Schumacher headers on it and ran 11.50s-60s @ 115-117. I switched to big Pro Part headers and it responded by running 11.125 @121. I also have Cal Track bars and good shocks with Mickey Thompson 275-60-15 drag radial and it hooks. If you sort out the suspension and get good tires and run 3.73 to 4.10 gears you should be running mid 11s no problem.