I did 265rwhp and 280rwt ( heads and cam ) and I'm running pretty lean. (94 5.0)
Finally got around to getting to the dyno. Went higher than I thought: 203rwhp/262rwtq. Only mods are BBK O/R H and K&N cold air. Smog pump and AC deleted and only 5 degrees of timing.
2012 GT500 543/533 11.7@120
1995 5.0 minute or two per lap