Rear suspension input needed

I have a 72 Demon 4 speed car 8 3/4. As of right now everything is stock no the rear suspension. I am looking at getting SS springs. The car is not mini tubbed or any form of modifications done. Right now I am running a 235/70/15 tire. Hope I gave enough info.

What type of shackles do I get? Straight/Offset?
Recommended shocks? Mainly street driven with 6-12 trips to the track a year.