Well, here's a reason... the value of your mustang will do nothing but rise in the future, whereas the value of a cbr 929 (as bad as they are) will do nothing but drop like a rock. Let's see... you can fit more girls in a 66. You said it yourself that you'll regret it later --- you can always find another cbr later easily, but can you find another 66 later like yours?
I'm not 100% sure about the pullies, but I can say relatively confidently that yes, they will, as long as you're using the serpentine belt system. This has more to do with late model setup vs. 66 setup. You'll have to wait on someone more knowledgeable than me to get a definate answer though.
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Neal
69 stang
351C/4sp
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