340 Block Bored to 4.160????? Help

I beleive the max overbore is .040 so the stock bore is 4.04 (or 4.040) so you can bore it to 4.08 max. so I am thinking that is pushing it on the bore. You can double check my numbers, It has been a while since I was in the books on this, but I remember not being able to go to .060 on these engines, I may be wrong. As for the overheat, i dont know if it is because of the overbore.