Hello, I am somewhat new to this site but I have 25 years of experience and I have owned 3 2nd gen camaros. I owned those before pro touring was the deal. Pro touring does have a look but I believe the heart and purpose of por-touring is function over form. If you lower your camaro to much with just springs you will alter the front end geometery for the worse. I believe the numbers you list will be a good. But a good visual reference is to view the lower control arms from the front at your new ride height. I keep the arms paralell with the ground and avoid lowering the car to the point that they run up hill from the center out. With the arms parallel you will find that a camber adjustment to less than -1deg and keeping a good amount of + caster(at least +3 to 4 deg) will be tricky but do-able. Moog makes an offset upper a-arm shaft that will help. You can go lower with spindles but tire clearance will become an issue. Or spend some money for one of the many aftermarket set ups. If you do this by all the parts for one company so you do not run into compatibility issues. I was on a tight budget when I owned my Camaros and the affordable set up that worked for me was trimmed to custom length Heavt Duty springs(Level a-arms), Urethane bushings(well lubed) Moog offset upper a-arm shaft, a trans-am WS6 32 mm(1 1/8") sway bar from local salvage, and KYB gas adjust shocks. Urethane bushing are Okay and an improvement over stock rubber but are still a compromise. The material urethane is naturally sticky and will squeak if not installed correctly and lubed. I have made most of the mistakes myself. So here is my 2 cents worth. Get the graphite impregnated bushings this will help the squeak issue but not 100%. Also get bushings that come with new outer shells. After you have pressed the bushings shells in your arms make sure that the urethane bushing will spin and are not bound up. I have used a ball brake hone to hone the shell to size if needed. Don't go to far or you will have to much clearance. I halve read that urethane is petroleum based and if you lube it with chassis grease the urethane can soften so get plenty of the recommended lube and apply it to all surfaces that rub and slide on metal. If the urethane fits to tight into the shell any lube will be wipped off and you will have a squeak. Get some urethane bump stops when you get your bushings. Good luck and most of all enjoy. Also if you have not already replaced the body/sub frame mounts do so it will tighten up the car and be a great improvement.