As fer V8's, it depends where it's come from as to the power. 92bHP for the original stage 1 V8, but it will run on just about any grade of fuel, and probably most peoples pee about midnight on a Friday. My V8 was out of a 1986 Rangie, 3.5Efi with RPI heads and a 3.9 throttle body - quite quick. Bugger, can't give a direct link, but
Click Engines on the Left hand menu, scroll down to Rover V8, click that, then near the bottom of page one is a table of all the listings, power, torque, vehicles they were fitted to...