66 273 hipo question

Holley carb, Racer brown cam, Doug's Headers. All were 4-speeds. Unless you have some pretty reliable history on the particular engine, it's probably pretty safe to assume it isn't an original (there weren't many, and they were built to be raced).

Here's a little more info: http://www.autohobbydigest.com/ddart.html http://www.seriousviewers.com/D-Dart/ddart.htm