I've reused rings, bearings.....took rotating assembly from one block and droped it into another, gaskets were the only thing new. I did it as an experiment of how far can you push the limits of low buck. It worked, engine didn't smoke, I raced it and won with it.
If you're gonna pull the engine down to gap the rings for boost, just gap, don't hone, the rings are already seated to that cylinder. Just be sure to tell your customer/friend it also might not work. You'll never KNOW till you try it.