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When we get blocks bored/honed here, we have to provide the pistons to the machinist before, so he can match the bores better.
Again, this is a question of how reliable you want it. The safest way is to go bulletproof, new forged pistons and rods, but if you are on a budget you can always go the safe way, by only checking piston to bore clearance and have the pistons inspected. I really can't tell over a forum, you need someone to look at them.
If your bores are oval, deep scratched or need more than a hone, you would need new pistons.
While you are at it, clean the camshaft oil sprayer bars. If there is RTV in there, you will kiss your new head goodbye in no time. And make sure the oil pickup point sits correctly, they are known to be trouble if damaged or bent. Too high = no oil ...
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