Exactly. What people simple cannot get through their heads is, carburetors like the Thermoquad and Quadrajet are unusual carburetors, even though millions of each were used. They are a mechanical/vacuum hybrid. I can close the secondaries on either one COMPLETELTY OFF and run only on the primaries. What size is the carburetor then? 280 CFM? Maybe? That's why they are so forgiving. You can run one on a slant 6 and tune it to run well, pull it right off, put it in a 440 and re-tune it for the 440. Some people just cannot get their heads around that.