I presume you remembered to leave room for your intake ducting when you came up with your radiator dimensions?

The radiator you've found that you can fit is about %85 of your factory 2.6L radiator, but it's also aluminum, maybe it would turn out to be a wash there, I'm not sure since I'm not an expert on these things. I suppose you could pop the $$$ for this radiator and see if you have problems. If you do, then it would be time to have one custom made. Last I heard that was around $500. Is it possable you can scrounge more $$$ and get something a little bigger to start with? Also, what are you going to be doing with the truck? Daily driver? Trailered trail rig?