According to this website, the engine code on your fender tag should show you which engine you should have in the car.

The "E63" code would be the 330 horse version.
The "E65" code would be the 335 HP.

http://www.stockmopar.com/how-to-decode-a-1969-1974-fender-tag-part-1.html

Mine is a 69' road runner with auto and a/c and is an E63, making the case for the blue engine.
(Origional is missing)