340 Rod questions

If your going to replace any of the rings you’ll need to run a brush hone though it or you’ll have problems. Once you pull old pistons and rings out, they never seal right again. If it’s standard bore, brush hone and use the hasting rings. You should pull the crank, make sure the block is super clean before you reassemble it. It’s not going to cost much more to do it right, like you said your already into the gaskets etc.