This was the case on the 7.3 I did 2 years ago. I even had to have the mains line bored after we put ARP main studs in it.

The instructions for the ARP 4.6/5.4 modular engine rod bolts say right in it that the rods should always be resized after new bolts are installed. Step #6.

https://cdn.arp-bolts.com/instructions/256-6301.pdf