Reply to "Consensus for Aluminum Shocks for Street?"

From Ted Mitchell's web site:
stock front spring rate= 235 lbs/in
Stock rear spring rate= 355 lbs/in
Note that after 40 yrs, OEM springs have likely weakened somewhat. GT5's used heavier springs frt/rear.

ALL stock Pantera suspension data is on Ted's free, no-log-in website, by the way.

Gas-charged Konis give 45lbs/in extra force just from the 350 psi gas pressure inside the shocks, so add that to your chosen spring rate.
As George says, ideal springs depend on how and where you drive, and I'll add, how heavy the car is. On our Pantera with 700lbs removed (so far), I use 300 frt/350 rear springs, plus the extra 45 lbs at each corner from the gas Konis. Larry Stock uses the same springs on his full-weight street/race Pantera.
Stock Koni bump-rubbers are larger in front than in the rear. BBSS racers 'tune' their suspension by adding/changing bump-rubbers. The main advantage of BBSS setups is, aerodynamics has more effect at lower speeds; downforce occurs sooner. The secondary advantage is more ride comfort and possibly more controllability.