Which connecting rods to use

Stock rods would handle that and a decent n20 shot... :)

IMO, with budget in mind, I'd figure out the cost to refurb a stock set vs. buying a new set of Scat I beams. Go from there.

The Scat's are a bunch lighter than a factory rod.

I did that. Just to resize and install new rod bolts cost almost 60 percent of a set of scat rods. Scats you loose the cost of pressing the pistons on, and you get the full monty.

Im going with scat rods.

EDIT: Just to protect the 340 block, and since going with SRP fordged pistons, at the very least I would go with the scats, and honestly would look hard at h beams. Even more so if its a fordged crank. Then the max HP limit would be the block.