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yeah same here. My 289 is running good, and i probably wont rebuild the bottom end. it's only got 53000 miles on it, but the heads need some work. So i think some bigger heads would do the job.
There is a guy in my neighborhood who has a 66, and he replaced the 289 with a 302 from a 69. He said he ported and polished some 351W heads for it. It runs very strong, so I guess that combination is pretty easy and fairly inexpensive to do.