Building a new 505 With Callies / Mopar Performance Block

I don't sell shims, we usually adjust end play buy using different timing chain cover gaskets. Superformance used to sell a bunch of different gaskets so that was the easy way. I've never run into one that needed that thick of a shim but if that is what you need then take a look at McMaster Carr. They have a very large collection of small ring shims.
McMaster-Carr