Andy is on target.

In addition, as a representative for Glen-Ray radiators I have sold quite a few to Superbird and Daytona owners (reproductions of originals). It is always suggested that these customers select the HD cooling core option because it helps to cool the wing cars better than an original did (the small grille opening being the largest problem). I'm not sure what your current rad is like but if it isn't in great condition, doesn't have an extra thick core, and have the latest in modern/efficient core design, you may need to upgrade.