This could be the beginning of a long discussion.....
My experience in a 3000 lb drag car shows little difference between 5.7 rods and 6.0 rods. I have turned mine as much as 8K with 5.7 rods and in a like motor with 6.0 rods same cam no difference in ET. The pistons can be found for bores out to 4.060 in Hypereutectic and forged.