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It also acts as a starter shim. Without it you very likely will have problems with the starter engagement on the flexplate/flywheel. You don't need to get one from a Mustang, either. ANY 66 or newer small block or 300 6 cylinder vehicle will have the one you need. You can probably get one from your nearest salvage yard.
thanks guys, i might call a few engine shops to see if they have one laying around
I asked about it at my local parts store and they didnt have it, and neither does NPD
Auto parts won't, but NPD? Call Glazier Nolan, tell them you need the 65-67 6-bolt rear engine cover, tell them manual/automatic, and you'll have it in your hand in a few days.