4bbl

Bone stock little 170/6 driven daily........
I drove this car over 4k with the one barrel and factory exhaust and was getting about 20 miles per gallon.
Know I am getting an easy 24 MPG.. runs cooler on hot days and idles smooth and it likes the 390 Holley and bigger exhaust.

Not one problem arisen by doing this with a bone stock 170/6.