Speed Pro 389 pistons are readily available. Good stuff. I would advise against boring it .060 as it WILL clean at .040. These things are getting a bit on the rare side. The $100-$200 you may save would be offset the next time you went to build it, by NOT having to find another block (at .060, they are done). It's helpful in these cases to look at the long term, and not just the immediate future.
FWIW
Jim
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