360 Re-Ring? Temporary Engine. Will it run fer a year?

The engine is out. The cost of parts to re-ring is cheap and you will do the labor yourself.
I would dingle-ball hone it, install iron rings and inspect it while it's apart. Doing the heads and replacing the oil pump is also a good idea. If you go this way you should end up with a reliable engine for a reasonable cost. Measure the bores for taper and unless it's excessive, the engine should easily last a year or more.
The alternative is to put it back in as is and hope that it's ok. If it's not you'll have to pull it back out and start over.
Just my opinion, it's up to you, but I was in a similar situation with a 318 and just put it back in, I'm dealing with the consequences of that now.