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I am looking at rebuilding my 1966 289. If the block has already been bored out to the limit can I use a 302 block with my 289 intake, distributor, Etc.
Absolutely EVERYTHING, at least external, will be the same. The only problem you could potentially run into is if your 289 is an early 5 bolt bellhousing block then you would have to use all the 5 bolt bellhousing stuff but if your block is a '66 this shouldn't be an issue. It should be the more common 6 bolt bellhousing block.