Fluidyne seems to cover many needs from my little 289 to the 468 FE.
Tried and true and I think standard for CXS cars now and designed for the opening.
Evans can help as there is no water, ie higher BP
Get a great fan, Cobras heat up fast and are hard to turn back once on the rise. Set the fan at 175F, then it will help soften the peak.
They are about $550 shipped
All in should be $800 with fan and Evans ???