If you saw black in the pan, after the dyno test..I'll bet it had issues then. The "street" clutch discs I use are red Altos..same with the bands, but the forward clutch could have a light tan, or dark metallic grey look to them if they used stock replacement stuff. You raise the issue with the builder before it was ever installed, so his reaction (I woudl think) should be fairly supportive. good luck with it..it's amazing how an outside source can make you want to dump the car. Just walk away for a while..that helps for me...