Ron---Uprated springs (20% more rate than stock) are available from TRF,
and other suppliers. The rear springs would be taller than the front. It
is generally not recommended to "mismatch" the front and rear springs.
If you also change the front springs to the semi-comp style like the
rears, you can expect the front of the car to (eventually) drop as much
as one inch, and the back end to go up slightly, due to rate increase. A
custom spring winder could take all of this into consideration in
designing springs just for your car, but if all you're looking for is
less "squat" without a ride height change, it may not be worth the
expense.
You can also get different ride heights from the various combinations of
trailing arm brackets available. For the front end, spring spacers can
be made or purchased to raise it, within limits, should you go with a
full set or semi-comps and not like the ride height.
Dick
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