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The parts interchange for 66 is definitely a plus but i prefer the looks of the 63 grilles the best. then again i own a 63 so its my favorite regardless. There isnt a better or worse year it all comes down to what you prefer in looks.
65 because the first year for the FE. Grill style is ok but for that I have to say 63. The filler bars on the 63 just have a more complete look not as much space between the bars like the 65. 61-64 updated to FE is a plus Id go for any of those.
I actually thought a lot about this before I bought. I decided on the 65-66's because I wanted the newer engine types, and I like the flat floor better than the step. I wished I could have found a 65, because I really do like that grill better, mostly because it is rare, and just plain and basic. I love my 66. It is my all time favorite truck.