VINTAGE ROAD RACING QUESTION

Well, just to spice things up a bit, the 273 wasn't the biggest offering in the Dart in '67, the 383 was.
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Don't know if the class rules will let you run a B motor, though.

before 1970 is was production displacement motors with 5 liter limit

1970 and after is ok for non-production 5 liter displacements with production blocks and heads.