If you bore again, .060 stroker (400 crank) will make it a 388. I'd just hone the cylinders and have the crank turned (provided it hasn't been turned before). Some people go .020 under on the crank, but I personally wouldn't go more than .010. You can tell if you have a steel crank by looking at it. A cast one will have mold lines in it. Change those heads!!!! Vortec seem to be the way to go.
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