Um ok. The 289 and the 302 blocks are the same on the outside. It not the best idea to use a 289 block for anything but a 289. The 302 block is maybe a bit stronger in the bores but that doesnt matter much. A 289 can withstand big HP levels much better than a 302. But if you have a good crank and set of rods then build the 289. You will never have a problem of finding 302 parts, good 289 parts are getting rare.
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