Replacing cap screw type rod bolts
Dial bore gage the rods with the original bolts torqued up / stretched. Remove and replace with new bolts and torque / stretch to new spec. Dial bore gage again. If they are the same as before, good to go. If not, take them to machine shop and have them resized.
If you don't have the required tools, the machine shop can do it with their rod checker and be even more precise.