Well, Your source + all of Mine (3) call it out as a '78 A-999 L/U behind pass. car 360's. That's a loooong download of trans codes on the 'Dippy' forum, the DC/MP Chassis racing/reference manual, & @VOETOM 's excellent manual. If somebody had a 318 Dippy w/a failed non-L/U A-998, they may have...