273/235 HP was re-factored by the NHRA down to 220 HP in 1976, then
got another adjustment down to 210 HP.
They were correct.
Other over-rated engine combinations.
1964/1965..........426/365 HP (Street Wedge)
1963 thru 1965....383/330 HP
1966/1967..........383/325 HP
1968 thru 1970....383/330 and 335 HP
1967 thru 1970....440/375 HP
The 1966 Dodge D-Dart 273/275 HP, was paper horsepower.