I'd do the rod bolts as a minimum. If the motor sees street usage the mains they should be fine. If you are concerned get them zyglowed or magnifluxed.
This is what I do. I allways replace Rod bolts, and just check the main bolts for strech. I always use ARP. Just a side note to the 4 cylender guys, that SB engines use the same rod bolt as 2.2 and 2.5's.
Just my opinion, and so far no problems. (fingers crossed)