Shock recommendations for SS spring car?

The ranchos would be a good choice. I think that CalTrac bought some of the 9 way line from rancho.

Best thing is to measure shock length with the rear hanging and shocks removed. Center to center on the mount post and add an inch. The extended length is more important than the compressed side. Really don't want the shock being your limiter on either end.

I think there are 3 base numbers with compressed and extended lengths:
99113 - 13.280 20.030
99114 - 15.410 24.290
99116 - 15.140 23.750

You might have to monkey with one of the shock end bushings because it's the smaller size than the A body ones IIRC.