Torque convertor and detonation

Yeah the super cool shop that rebuilt my motor insisted I didn't need a bigger/new carb... but charged me $350 to "tune/rebuild" my 500... that had not a damn thing wrong with it... stupid me. It does run fine and seems appropriately tuned to the car. Still, we can all agree a 750 would be more appropriate. I have a 650 on the bench that I could slap on the car and tune, just haven't got around to it. Seems like the TQ is king though. Might not be worth getting a spread bore intake though