you shouldn't have any problems with the bottom end unless you're running some severe upgrades and higher than normal forced induction....I personally ran a supercharger at 6-8psi, cam, heads, custom intake, etc...on the stock bottom end without a problem...I know other guys running up to 15psi boost on stock bottom ends without problems...a simple cam/tune isn't going to be increasing the power enough to bend rods or anything like that...