My local NAPA did the machine work on the block for my 470. They even checked and corrected the heads I originally ran on the motor which were done by a reputable Mopar shop that most everyone on this board raves about.

The same NAPA has been doing the machine work on two of my buddies cars for close to 20 years; both are 10 second cars that are dead consistent and in the winners circle multiple times a year.

As most have mentioned, I think it just depends on the individual shop.