With regard to air jacks, also keep in mind race suspension travel is greatly limited; wheels/hubs drop only a small amount when lifted, compared to a street suspension.
I think you might find that the wheels could still be touching the ground when the jacks are deployed.
My car is lowered and I've been using the two-by-four method for years on all my P-cars, even with a very low jack.
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JGM
2002 Boxster S
1973 911 Green FrankenMeanie
PCA DE Instructor circa '95
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