Which is better, for mudding first, rock second, and performance 3rd? anyway to improve how gas comes out of a carb to make it work more like a tbi? i don't know what to do Is it harder to go from tbi to carb or from carb to tbi? this is to help me decide between a later model or earlier model blazer. seems later models were thinner but galvenized, older was thicker, and older had better transfer cases. so this is the big difference now.