They just have a tendency to brake if put into a BIG bind(i.e. perfect traction with drag slicks and a 7,000 rpm clutch dump or something like that). I've talked to several 350 V-8 powered old school Z guys and most of them are not having nay problems out of their R200s. One of them is putting down 360+ hp to the ground too with a factory R200.
76 280Z the never ending project 89 Sunbird GT Turbo 9.7@74 mph 1/8th mile 02 Accent GS autocross car