To the best of my knowledge, there are no carb conversions that have been combined with reground cams (either on a Stage 2 upgraded engine or otherwise) However, as opposed to a forced induction system, I don't see any reason why reground cams couldn't be added to a carbed DeLorean.
A number of months ago, I did some research on the upgraded cams and decided to defer the mod unless I ever need to remove the engine and or heads. Between the Peugeot carb system, Volvo distributor, HEI and headers, 5052 produces enough power to make me happy :-)