Kaiser started using the buick v6 in 66 and in 1968 a new law came into effect requiring side running lights so it is either a 66 or 67. The VIN and registration should say which. Either which it is, it's a sweet little CJ for certain.
I had a 71 CJ5 it was the last year for the 225 Buick V6.
You could get the V6 from 65-71. Pre AMC. My 71 had a off set Dana 44 with one piece axle shafts.