Radiators: Is 22" enough for 400 HP?

That's nice that the shroud is so close to the tanks. I've ended up cutting up my factory shroud for hose clearance and adding some strips of aluminum to get it as close to the radiator as possible. Sucks because it's a one year only 67 V8 shroud, but oh well... Do you happen to remember which Champion radiator you bought (cc526, CC2375, etc)? It seems like the one I bought has the shroud mounting surface a lot farther away from the core as seen in the picture. The one in your picture seems close to the core.
No, the PO bought it and we don't have a purchase receipt for it, and I have not tried to ID it. Yes, there is not much space to the core on those sides, we had to be careful with the drilling and with the screw lengths.

Merry X-mas!