Timing Chain Cover

All the LA aluminum covers will fit the engine, but, the timing marks may be in a different place depending on year. Your year came with a removeable gauge on the passenger side. In late '68 and '69 it was cast into the cover on the passenger side. In '70 it was cast into the cover on the driver's side. You can use your timing gauge with the '70 and later cover, just ignore the cast in gauge. The only other major change after that was in '78 when they went to a seal that can be installed without removing the cover.