New to the forum, and would appreciate any input on this an future posts. In the process of improving my newly acquired 48 Willys truck. Immediate issue is bogging down on acceleration. Can be many issues, but am starting with the carb. Upon removal, I found this casting section and u shaped tube & Ball between manifold and throttle body. Any ideas?? Purpose?/ Do i need it?. Could it have been used in the past as some sort of pre heater mechanism?? Thanks in advance,