So I should just buy a new 4" snout? I'm planning a Harm balancer, and nope all I got is this old GM truck blower... Yep I figured I would have to get a different idler bracket, but what about the idle pulley? Most of them I see have the edges on them to help hold the belt on, do I need to have one with sides or will mine work W/O problems...thanks for your advice Kurt