All 67 383 A-Body's came with 516 heads, basically the same bowl as a 915 but with smaller valves, if your car has 915's then they have the larger valves. BTW, there were 457 Dart GTS's made, don't know where the 458 number came from?!?
That is correct......... '457' = 1967 Dart GTS 383 cars produced.
In 1967, the #2780915 Cylinder Heads with the 1.60" Exhaust Valves could be
found on the following >
* 440/350 HP > Chrysler > Newport, Newport Custom, 300, New Yorker, Imperial and Town & Country Station Wagons
* 440/350 HP > Plymouth > Fury {I, II and III} Station Wagons 'only'.
* 440/350 HP > Dodge > Monaco and Polara series
The #2780915 '440 HP' Cylinder Heads came thru with the 1.74" Exhaust Valves