OEM 340/360 rod in a 408 stroker...??

I answered you on Moparts too...
The early 318 and all 340 rods are bushed already. To have a set redone properly cost me about $300. The same will be true for the later (after '71) 318s and all 360 rods need to have bushings installed to run most piston choices now. The only equivolent price rods are the SIRs. I'm not a big fan of SIR rods but if cost is the only concern they are around $280/set assuming they need no work. And some do. Any rod that has a rod bolt an nut, ratehr than a cap screw, will need the bores notched at the bottom. Some H-beams will need clearance regardless of the capscrews. Any build that wont be reved over 5800 and under 500hp will live just fine on factory rods. Above either of those, you should get better ones.