Weiand #8007 intake on a 273 (Several questions)

A 750 on a 273????? 600 MAX!!! Otherwise you WILL murder any low end torque you ever had!
And you'll have to put drain plugs on your spark plugs to get rid of all the extra fuel in the cylinders. I have a 600 Edelbrock on mine. It works well. Let me check the manifold and see what carb it would like.