IMO, a car running 11's with a stroked bb motor and "appropriate" gearing and a 3 speed auto trans doesn't have the motor accelerating at a fast enough rate to see any real benefits from using a rotating assy that has "extra light" parts in it.
I wouldn't spend any extra $$$ on getting parts that are lighter than whatever the std offerings are(which are still much lighter than the OE stuff).

Doing a better job of getting air in and out of the motor will pay off way more than a hundred grams of bob weight will.

Spend the money on a roller cam set up instead of having rotating assy parts made lighter.