The B&S engine in the 582 was notorious for valve seats falling out. It made the carb puke gas and a lot of time burp oil up the vent. No easy way to fix and no cost effective kits that I can find. Pull the plugs and look in the cylinders. You will see it if it's a valve seat. If so just stop and look for another motor.
There was a guy on here recently that tried to put a CH in a 582 and had to do quite a bit of work to get it to work. I didn't think it looked like a big deal.... but I have a lot of experience. Anyway... No real good "direct swap" out there for it, but yes, you can repower.
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