Reply to "What is the correct carb/manifold combination for my 1972 Pantera?"

North American Panteras utilized the Motorcraft 4300D spread bore carburetor.

There were two versions of the cast iron spread bore intake manifold designed for that carburetor, having casting numbers beginning D1ZE or D3ZE. The D3ZE manifold had a big trench running along side the carburetor mounting pad for exhaust gas recirculation. Your 1972 engine would have been equipped with the first version with a casting number beginning D1ZE (no trench).

Over in Europe I believe De Tomaso fitted the engines with 650 CFM Holley double pumper carburetors, Holley list number 4777. This was a much better carburetor. To install the Holley carburetor De Tomaso modified the spread bore intake manifold (elongated the large secondary butterfly holes) to allow the "square bore" Holley carburetor to fit.