They don't list an LS swap radiator unfortunately. Looks good outside of that. Someone else recommended Griffin, but same issue.
I'll probably end up with Silicone couplers and aluminum tubing for the radiator hoses.I looked into an LT swap radiator for ReTonkulous. Both are on the drivers side. Found a hose at the auto parts store, they let me cruise around in the back, that fit the lower PS radiator outlet to the pump on the DS. Used the stock hose for the upper. Lucked out with both. Factory 4 row unit. But not nearly the ponies you are planning.

I saw the DeWitts, but like a few other brands when I see a fan shroud that doesn't cover the entire radiator I keep scrolling. This thing would not work in AZ.I've got a DeWitts in my Camaro, the core material is good, welds were good.
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C10 Truck LS Swap
DeWitts™ Direct Fit® Aluminum Radiators are assembled in Michigan and come with a Lifetime Warranty. Order your DeWitts aluminum radiator today!www.dewitts.com
I've also run Ron Davis, no complaints there either.

I’m sure they have a wait time on it unfortunately. It took them 2 weeks just to answer my email because they forgot. I had to eventually call them to get a quote.Show me where I can click on "buy"...
I sent them an e-mail, waiting to hear back. I don't even know how much it costs, but I'll likely get it. I can always upgrade my 14" DetaPag fans to 16" fans if I need more cooling than the derales it comes with do (or if they're too annoying). I can use the same controllers, I'd just need new fans.
Exactly why I keep scrolling when I see a shroud like that one.I saw a program a long time ago that looked at electric fans. A one inch gap between the blades and the fins was a minimum for good flow. Less than that flattened the air flow as it came out of the fins. Reduced flow dramatically.