If I could start over I'd trade the "turbo" brakes for the ability to run 15's.

 

My 78 SC sported 930 flairs a few years ago before it was converted to a spec 911. It had full ERP suspension and 930 brake calipers. The car still had a carb'd 3.0 L motor which put out 240 hp on the engine dyno. I used 18x9/11 3 piece wheels wearing 245/275 or 245/285 tire combinations depending on what brand I used. The car handled like a dream, but suffered from too little power for its brake/wheel/tire/suspension package. I am faster in it as a spec 911 and where the rules limit it to 16x7/8 wheels and 225/245 RA-1's.