SB Intake Manifold

The original 4 barrel manifolds work fine for a 273. They weigh about 40 lb. Your not dorking with intake bolt angles, choke or bypass hose adapters. They will give good power and good gas milage. The original Commando manifold beats the pants off a 2 barrel setup. It is hard to find 64-65 273 4 barrel manifolds made by anyone. Let the OP weigh his options and make his choice. I'd say he has 2 good choices.