[Big-Foot]

Rods - You can probably get by with magnafluxing them, installing new bolts and re-sizing the big ends.

Pistons - It all depends on what you are going to do with the bores. If you are boring the engine to the next oversize, the pistons you have are now better ashtrays and paper-weights. If you are not boring the block, you need to have each piston mic'ed to determine if the skirts are worn too far to be re-used, cleaned and check the tolerances of the ring grooves and wrist-pin holes and then finally have them Zyglo inspected (looks for cracks).
New pistons will cost about 25-50% more than the work you need to do to re-qualify used pistons.

Hope this helps!