Exactly. I am building a 440 with the old TRW six pack pistons and rods.
Others talk about how heavy they are, and they are technically correct about the weight.
But does it really matter in an RV engine that won't spin north of 4500 rpm?
As long as you have a good set of rod bolts I say no.
Bottom line, for a 340 street engine if I had a set of the TRW forged heavy pistons would I use them? Sure. If I had to buy new pistons though the lighter ones (provided a rebalance is in the budget) are a no brainer.