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Seems a little unlikely that you would have a 727 behind a 318. One would expect a 904. But then, the whole setup is pretty unlikely.

One thing to remember: Valiants are on a 108" WB, Darts are 111", so a 2nd gen Valiant (or Barracuda) is always lighter than a Dart. I'm not sure where Dusters fit into this.

Wow. My 273 Commando, nominally 10.5:1 compression (probably less at .030 over), at factory timing is right at the edge of pinging on 91. It's iron, of course. I'd say it's a maybe -- you'll just have to try it.