My '77 came with what I think is a knockoff Weber carb. It works fine. When I bought the truck it had no air filter so found a Weber filter & filter housing and have been using that for the past year and a half. The filters are onlyl 8"x4" and get pretty dirty quickly. Was thinking of installing a factory air filter housing and modifying the carb connection from the round factory opening to one that would fit the Weber carb. Just wondering if anyone else had done something similar. Have access to a sheetmetal shop so can fabricate the connection piece pretty easily. Figured I'd put it out there just in case I'm not thinking of some reason this wouldn't work.