I am considering switching over to some Ground Control coilovers. First, here is some information on my car: Early '71 240Z currently has stock struts, 5-way Illuminas, MSA lowering springs, short steering knuckles, PU bushings. 15x7 Konig Rewinds mounted with 225/50/15 RA 1's. '83 280ZX engine, bored 40 over, with '83 5 spd and 4.11 open diff. I mainly use the car at track day events like NASA HPDE and similar events. So far I have only done bolt on mods to the car, since it was a fairly low mile, early car. I pulled the original engine and set it aside for safe keeping. I figured once I retire it from track duty, I would restore it to stock condition. Is it worth going with coilovers without also doing the camber plates? I did not like the idea of cutting into the strut towers. Does anyone know which Illuminas fit into the sectioned struts? Or would you advise going to a different shock? What would you recommend as far as spring rates go? Thanks, Marty