Join Date: May 2001
Location: Chattanooga, TN, USA
M22 was an option, not standard on L78.
JH is correct for L78 w/standard shift. Check the VIN on the engine. It will be either on the engine pad, by the JH code, or down on a flat by the oil filter.
Other clues to original L78 would be single fuel line (and no evidence of it ever being dual line, like fuel line clips, sending unit). 6000 redline, 7000max factory tach.
Evidence of ordinary b/b has been well documented on this forum. do a search
Hope it's a real one!