Are your springs stock as in original or stock as in replacement stock?  I'm not sure a set of shocks will overcome weak springs or rear spring wrap.  Is the back end dropping equally on both sides or is one side dipping down further than the other?  You'll get some twist from engine torque but an excessive drop on one side could point to a spring problem.  Also, if your considerable increase in horsepower wasn't accompanied but subframe connectors and other mods you may be getting as much or more body twist than suspension movement.  The weight transfer you apparently have now is desireable for drag racing but what do you intend to do with the car?  Before shocks you might want to "design" your suspension to make sure that all of the components you purchase are compatible with what you want to end up with and how you want to drive your car.  All that said, shocks are relatively cheap and easy to install so it can't hurt to try.

I fixed my "Checking the power lines" attitude on acceleration by swapping the original stock front springs with a set of progressive springs also.

Thanks for the replies. I've ran the gas-a-just shocks on a previous car (c*rv*tt*) when I went to heavier springs. Great handling but bounced my head off the t-tops at times. I''m thinking they may be an answer using the stock rated springs. I'll look into the progressive springs if the shocks aren't enough.

Tubo, why the gr-2s in the rear? Just curious.