1966 273 Question

if that motor is in a 66 ply barracuda it isnt the orignal 273,,if it was the orignal 273 2 or 4 BBL carb,,it would have adjustable rockers,,not stamped steel rockers,,,im guessing some one changed the motor,,with either a 1969 273 or and 1967 and later 318....unless they changed the heads and cam on the orignal 273,,my guess motor was replaced,,,,look and see whats on the side of the motor telling you the cubic inch,,