When I had my '69 AMX I also had a '69 factory service manual. It covered the AMX and included the 390 engine. The '68 factory service manuals I have seen include the Javelin, but only up to the 343. Since the AMX was a mid-year introduction, was the service manual for '68 ever updated to include the AMX along with the 390? Was a supplement addressing them ever produced? What do owners, particularly with early production '68 AMXs use? Thanks in advance, Jerry Phillips Las Vegas