Quadrajet on a Slant Six

Not quite sure why you would want a 4bbl carb that the secondaries would only partially open?On a 225 engine the secondaries will fully open if you have the proper carb.The reason you secondaries wont fully open is because your 750cfm carb was designed for the vacuum of a 400cid-450cid engine.

Bigger isnt always better,but if it is working for you more power to ya !!!!