My CalTracs and split mono springs came with the avatar roller when I bought it. So I cannot tell you which springs they are. But here it is with the 28/10.5W-15 bias slicks on it:
View attachment 1716219690
I think that pic is before any start to the burnout. I would say if I would order new, I would want to lower it about 1/2" as it would look better when I have the street tires on it (P295/55R15 MT ET Streets).
Another pic - this at Gainesville:
View attachment 1716219707
I can tell you this combo dead hooks. The only time there might be an issue is if someone dropped water at the line. Best of 11.10 @ 119+ (footbrake, 5000 stall TC). Typical 60' time of 1.52 (but it has gone 1.49 once!). As for noise, yes, if you're on a rough road and have them set close or almost no clearance, you'll hear them hit. But in a car like this, it's just part of the aura of the car. It's a "who cares!" I don't generally drive this on rough roads given the skinnies up front!
