Weight Transfer and Suspensions
My assessment is based on my experience. Yes you can go fast on leafs with or without CalTracs if you want to put the work into that setup but you still end up with limited adjustability. Now if you run only at good race tracks then that isn't a problem. If you run at tracks that are only marginal then you are going to have problems possibly even if your car is only a 13 second ride.
Now I'm not advocating four linking a 13 or even a 12 second car but if you are running in the 10 second range or faster I'd say you are probably a pretty serious racer, at that point you need to assess your combination and the tracks you are going to run at, are you going to be serious about your racing operation or is it only a part time once in awhile thing. If you're running for points at your local track and wanting to go to the division finals then it's more than just a funtime hobby and you should be getting serious about your car. Just because you can go 9's on CalTracs at good tracks doesn't make it a good suspension system. There are two reasons I say this.
1. Most leaf spring cars are limited in tire size, on a marginal track the tire size is all important. The more rubber on the ground the better the chance of limiting tire spin.
2. Spring, axle and body movement. The more you minimize this the quicker the car will be. Instead of the suspension taking all that time to work, that movement could be transferred into making the car move forward.
I respect all your opinions but there really isn't any arguement that a four link is the best suspension and the wider the tire the better the traction.
In the end you have to assess your situation and your expectations.