There's no single answer to whether a V8 Mustang or V8 Camaro is faster. The speed depends heavily on the specific year, model, and trim level of each car. Both manufacturers offer various V8 engines with different horsepower and torque outputs, and other factors like transmission, weight, and optional performance packages significantly impact acceleration and top speed.
To get a definitive answer, you'd need to specify the exact year and model of both the Mustang and Camaro you're comparing. Then, you could compare their published 0-60 mph times and quarter-mile times from reputable sources like automotive magazines or websites.
