Good Street / Strip Springs?

There is no true "balance" that can be made drag vs. street springs.

Street springs mean they are somewhat stiff and equal on bound/rebound. The front's characteristics will match the rears, but because of the weight distribution, the springs are not the same.

On a drag car, the front springs need to be really soft, which will make the front end lift up very easily. The rears are completely different. They need to be extremely stiff; stiffer then the "lowering springs" as well. This forces the front end to come up, and the rear to stay planted.

The problem with the drag setup for the street is that the front end will bounce like a po-go stick on any kind of bumps, while the rear will be harsh and stiff. This does not make for a fun car to drive around town with.

I think the only realistic balance you could come up with is lowering springs on the rear, and stock replacements up front. This will however make the car sit too high up front, so coils will need to be removed from the front springs, which is a nightmare.

IMO, you may be able to get away with drag launch springs on a DD because you can adjust your shocks/struts bound/rebound rates.. This may allow you to have a decent riding vehicle during street trips, but once you hit the track, you would need to change the settings.