You are correct, 1967 was the last year for the 289 hipo in fact the 289 in general. Ford started to use the 302 in 1968 and introduced to 302 Boss in 1969. The Boss motor shares a lot of the same attributes as the 289 hipo. You could say that the hipo was the predecessor to the Boss. The only other engine that I know of with an HP designation is the 390 HP which is also called the Police Interceptor. Ford used hipo to differentiate the particular build of the motor from others of the same CI. They did the same thing with CJ, SCJ. There was also a 289 Challenger (A code) which was just a C code with a 4bbl carb.
__________________ 1967 Mustang Fastback
Acapulco Blue
289 HP bored .30 over
PA C4 transmission
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