440 six pack pistons and some questions

On stock rods and those pistons I'd go with press fit pins, simple and bullet proof. Resize the big end with new rod bolts.
Im not sure I know what you mean, are you saying to not use the wrist pins that came with the pistons but to use something else instead?

What does it mean to resize, I understand that you suggest using a stronger ARP bolt, is there a specific one you can recommend?