Anybody?

[TN70C10]

I just bought a 350 from my buddy. He said its supposed to have aftermarket rods and forged pistons. I pulled the oil pan and im thinking it looks like stock crap. The rods dont have any markings xcept AC in between the flat end of the cap and the rod bolt nut. The rod bolt nuts are 6 point and I was thinking ARP nuts were 12 or is that vise versa? Looking up inside the piston skirt I can see a S inside a shield looking emblem and a SA , also the bottom of the piston above the pin has a cross hatch, waffle sorta pattern in it like it was cast in it. It all does look fresh can still see where the cylinders were honed and very little scratching inside the cylinder. Anyway if any of you have any stock rods out could you check for the AC on the cap and look in piston skirts I would appreciate it. Can anyone id a block for me? CLU.