The logical choices with BB Chevy rods are 6.70, 6.80 or 7.10. With a stock stroke the pistons are going to be super tall and heavy so there isn't much reason to stay with 6.7 or 6.8 rods. Might as well go with the 7.1 and take a little weight off. 7.1 rods are fairly common. If you go to Summit you'll probably find 20 different part numbers for them. Basically everyone makes 7.10 rods, they are very common for stroker motors.

If this is all new to you then you might want to pick up a copy of my big block Mopar book at Amazon. I have a lot of pictures in there of stroker motors and various components.