stock 340 rods

The issue with mopar rods is never strength nor cost...lol. It's weight. IMO, by liberating the very heavy factory pistons you make a factory rod much more viable. They will take any rpm the block will with good bolts and better pistons. It costs me $300 to have a set of factory rods redone, new bushings, resized, ARP bolts. Shot peening is part of the cleaning process for them so that's in there too. A set of SIR Eagles, probably the weakest and most iffy quality rods now available, are $300/set and a LOT lighter plus use a smaller big end footprint for block clearance on strokers. I avoided them when they first came out as they used to have a problem with quality related to metalurgy and some were pulling apart at the beam. That seems to have been addressed as I havent heard of it for several years now and there's a lot in service now. H beams are more depending and many of them need to be resized after you cycle them a few times. So the cost starts going up. IMO, if you haev them, and the labor's cheaper, use the stock rods. They will take most of anything a NA engine could throw at them.