Reputable 6.4 Crate Motor Company?

[Kennewick_P.Wagon]

So, I really enjoy my Wagon and with the price of new trucks I'm thinking about sticking to 'ol Bessy long term. If I do that, however, I only want to do so if there is a reputable company out there that builds 6.4's that fix all the weak points for our 2500's. Anyone have a recommendation? All I've found thus far is hot rod motors. Thanks in advance.

 

[Soapy]

I have used ATK engines in the past with good luck. They were 318 and 360 motors. I would contact them and see if they have anything.