Regarding the SFC, the types on the market that weld all across the floor pan are NOT ALLOWED with the SCCA Solo/autocross class rules of E/Street Prepared, which is a highly competative class for pony cars. Therefor, my eventual choice of SFC is only allowed connect to the front/rear frame rails (not the leaf spring mount as Hotchkis does). I've raced the car in SCCA solo/autocross since 1975, made progressive mods (all following the SCCA "rule book")... car is very stiff/flat and handles superbly, great to drive on street and especially hwy/road courses... all without SFC. I believe SFC would further help the performance, but the only type I could install, legally, are the types that attach only to the front/rear (and, they can be welded f/r which was an eventual SCCA rules allowance a few years ago.) Also, the floor pan cannot be cut per SCCA rule book of class E/SP. I believe there's an allowance that the SFCs can attach (bolted), additionally, at only one extra point to the floor, such as the tubular Magnum SFCs.... those are of consideration to me. Regardless, I need some ground clearance, as well, since the car sits low.