for street driving there is only so much lowering that can occur before the car becomes unusable. lower so control arms parallel to ground or a little lower than that is about all you can do reasonably. any lower and headers and sump become sacrificial bump stops.
I'll get to the drop spindles when I start doing some serious racing. I planned to keep driving the car on the street until I got a lot of the bugs out but you see what happened there...
Drop spindles and castor joints are next on the suspension list for sure.
Itīs really a great mod, I did it some years back on my Trackday/Street-Alfetta and it works wonders in the corners! Not that hard a mod to do either!