Turbo 383 in a A-body Barracuda

Picked up the block today!! Looks good but I wonder if I should get everything double checked??

The machinist also told me that since I changed the 8740 ARP rod bolts to L19 that I need to have them resized!??

Anyone elaborate on this!!??

Here is a couple of pics after I painted the block Mopar Turquois,

I am guessing because the Clamping force will change?