(http://i52.photobucket.com/albums/g8/BobWardlow/penad2_zps1ca40223.jpg)
(http://i52.photobucket.com/albums/g8/BobWardlow/penad_zpse1709d03.jpg)
That must be a very early add. The Penton appears to have the old style air box (early 68). BTW-I need one of those air boxes for no. 215. joe
Roberto sells them