I have a 68 coupe with a 466 560 horse,a c-6 and 3.89 gears.I have MT sportsman pros on it 26x10.5x15 and the car dont hook for **** on the street.I havent run at the strip yet.have 620 lb springs on the front and 5 leaf springs on the back and Gabriel Strider 3way shocks all the way around.so my suspension is not much for weight transfer.What is your combo now? Maybe I can help you out if I know what your running now.Have you had the car to the strip? How much power have you got?
Mike 545 may be able to help also he has a 545 in a 68.
Hoosier Quick Time Pro's (DOT legal slick) for the rear, as
Any traction device like Cal-tracs, Comp Engineering Slide-a-link, SouthSide Machine lift bars, or maybe even the Lakewood cheapies....
It may help to remove the spring clips from the rear section of your leafs, this will allow for some extension. If your leaf springs are tired, get a new set. Super stiff front and rear shocks are a no-no for traction, as they limit weight transfer. A set of Rancho adjustable rear shocks, or the Lakewood or Comp Engineering drag shocks will work well too.