340 Rods, speed pro L2316F “stock” weight is more than stock piston

I HIGHLY recommend pricing out new forged rods before you send out for balancing. If you choose to use new ARP bolts you will have to have the rod and cap bolt bores bored oversize. That and reconditioning the rods is gonna put you a stone's throw from the cost of new rods. The thought of using 50 year old rod bolts was a no-brainer for me...chuck a rod bolt and you've scrapped an engine.

Been there, done that. Broken rod bolt ruined a pretty much stock but high mileage 440. Have never re-used rod bolts since.