I run a relatively tame 502 (a 460 block with a 4.39" bore and a 4.15" crankshaft, 225/235 degree hydraulic camshaft, 9.5:1 compression). It makes 515 hp at 5200 rpm and 585 ft-lbs at 4200 rpm. During the summer months, it runs pretty hot in heavy traffic, about 220F. I really like the wide power band and the sound of the engine, but granted, it's not a traditional setup by any means (e.g., not an FE engine). It's not true to the Cobra heritage.
