This may help the air cleaner questions, this assy. is what came on many factory build 5-S cars. Some were imported by Stauffer-39 examples, Wilkinson a few less, & us back in the day. Kirk (Amerisport) had to make his air cleaner boxes specific to pass emissions here. The last one of these we sold was over 2 grand last year. Believe it or not they still pop up for sale occasionally.