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Got Herb Adams Adjustable shocks in the rear(12 years old when I used to autocross the car) I did just install QA-1 coilover shocks in front with 450 rate springs.
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The QA-1 replaced the factory springs also?
(your front end modified?)
I'd check for shocks topping out.
Usually the 'porpoising' is from a mis-match in springs front to rear.
(harmonics - like too stiff front)
Try some softer springs on front plus check for shock topping out.
(or limit the travel of front for a couple passes)
Also what's pinion angle?
Lots of things to try that don't really cost much to see what works.
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John Wallace - johnta1
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