[storm9c1]

The 292 definitely has a different flexplate than all other L6s and SBC. As mentioned, it needs 3 dowels and larger bolts.

The good news is, depending on what trans you have, you should be able to get a parts-store replacement flexplate. Companies like Pioneer and ATP still make them. Just search for a flexplate for any 70s era truck with the 292.

Then again, what trans do you have? They were mostly mated up to a TH400, and are usually drilled for a 6-bolt converter. Will also work with a 3-bolt converter. But might need a custom drill for something else.