I have no idea, But you could try here: Pontiac Overhead Cam SIX Forum http://sohcsix.yuku.com/bsohcsix or look on this site @ http://www.oldride.com/library/1968_pontiac_tempest.html Good Luck.

OHC = Overhead Cam, 6cyl. model. Question is: 4bbl. or 2bbl.?