All I've ever done to the conrods was shotpeening, balancing & one time polishing. Show your standard datsun rods to a Chevy or Ford V8 mechanic & they'll weep. The Standard rods are tough enough with a little work for what your doing, unless you do like an off road racer did once & number them with a file. Instant stress risers. You could use ARP con rod bolts if you want, but you can get by with the standard ones.