Carb CFM recommendations

flyfish said
Since you don't care about performance, any carb will do.

For what its worth, when I lived in Colorado, I started out with a 318 in my 67 Barracuda....that motor I had a Holley 650dp on it, and it was happy....Drove it from Golden to Greeley all the time. This was back when she was slow (high 16's in the 1/4).....She was a good daily driver.
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Just to clarify, performance is still important. But we are looking for midrange power and consistent throttle response. We just do not care about maximizing peak horsepower at WOT above 5K rpm. And I have seen from others that it is easy to kill bottom performance end with too big of a carb.