clifford manifold

Any thoughts on clifford man./2 bbl addapter and 350cfm. Thinking of running comp cam w/252 grind,not looking for a road rocket, just better performance. Getting the idea of staying away from rebuilt 2bbl for super six because of threads that having nothing good to say about rebuilt carbs. Also, any real life exp. with either the comp. 252 or 264 mech. cams (complete setups please ex. rear,carb,stall ect)