340 hp capabilities?

You need an aftermarket block.

Seriuosly, some people must think that those of us who invest in a good block are stupid. Chrysler didnt make the X blocks because people were standing in line to buy them. They NEEDED them. To spend ONE red cent trying to make that kind of HP is idiotic.

And ditch the engine builder who told you hard block creates a thermal whatever by anyhow because he is goofier than a bowl of fruit loops. Herd block has a purpose. If used correctly it has benefits.