PAT i went to blower shop site and that tbs billet 250 looks sweet as dose the price its not that i cant find 250 blowers just worried about the belt would rather have a toothed belt.2 inches is 2inches but if its going to cost more than a 50hp loss- 2 inches isnt enough to mess with then. Got another question vacum since itll have 2 carbs holley hp,s that are boost referanced anyways can i run vacum to brake cyclinder off one carb the line on the back of base plate And run pcv valves that are teed together to the other carbs base plate line? DO you run any type of pcv valve or just let them breath out the valve covers