Reid,
We really have to break this question into two parts. First, the only Tigers
that came with 289's were the last, and rare, Mk II models. These are the
most valued Tigers, but it isn't because of the 289 versus 260 question.
With regard to the engine per se, probably most people who need to rebuild
their 260 opt for a 289. They are externally identical if you get an early
5-bolt 289. The 289 is easier to get parts for and has a skoshe more
horsepower potential. On the other hand, why not just go to a 302? Even put
a 302 crank in a 5-bolt 289 for example, or use a late model with a roller
cam for a really sweet ride. If you value originality, a 260 that is well
built can be quite a performer. I am sometimes tempted to go back to a 260
like originally came in my car just to make this point. Just look at what
Chittendon and Cartwright did with the 260's they built in the sixties.
I would put the 260/289 question aside for the time being. If you want a Mk
II and are willing to pay the premium, then go for it. Otherwise, look for a
Mk I in good shape. Engines are easy to replace, compared with restoring the
chassis.
My 2 cents worth,
Bob
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