'66 Vs '67 4BC ENGINES
As noted the 1 year only upper and lower Aluminum Belt Cover.
Harmonic Balancer/Damper.
Intake Manifold. ( No heat crossover within the carb mounting surface)
Another 1 year only, Pancake Breather with a Tall Neck Base.
And the Painting detail on the Cam Housing and Belt Cover.
'66 was the only year to get this then it abruptly went away. My guess, Cost.
Nothing else comes to mind but I'm sure there are a few other little details, otherwise, they are the same engine.
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When I die, I want to go peacefully like my grandfather did, in his sleep.
Not screaming like the passengers in his car. 
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