trying to identify aftermarket 340 Pistons

Of course he wants to sell you something, he is in business to make money. You may not like his personality but I have not heard anyone complain about his parts and combinations that bought from him. There are parts that I prefer over his like rocker arms and lifters, but the parts he sells are quality parts. He knows what he is talking about and has good combinations. If your not a do it your selfer and don’t have a solid path to an engine you will be happy with and performs like you want it to, you need to find and trust an experienced mopar engine builder.