No, you can't. They don't fit. Besides, the stock headers off an 89 are terrible. It's worth it to just spend a little bit of money and buy the right headers for the car. Any headers designed for a 66 with a 289/302 will fit. For good quality headers at a decent price, I like hooker competition headers. I had them on the old engine in the 69 and was very pleased with them - have hooker super comps now.
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Neal
69 stang
351C/4sp
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