Doc, even the 50s 4 barrel hemi intakes would need an adaptor to put a thermohog on. The original 4 barrel carb base in the 50s is even too small to put a modern AFB on without an adaptor.

You would need to step up and spend a pile of $$$$ on a modern intake for that 50s Hemi if you want a Thermoquad on it. Even the 426 ended production before the Thermoquad came along, you would need to buy an intake or add adaptors to put one on even a 426 Hemi. Gene