We can build just about anything in a Dual-Pass setup for you. The only "issue" with the DP setup leaves the hoses on passenger side a la LSx swap
This is our 68-77 GTO/LeMans radiator thats supports 900hp and flows 5600CFM:
Since it's for the for the 'bird chassis, you're looking at a similar design to this, but in a dual-pass or cross-flow with 1.25" tubes and giant fans
Both setups range $940-960 plus the ride. There will be a build time of ~2-3 weeks since completely custom-built.
Jeremy will happily order one from me for you!