Carb size ?

[GTX JOHN]

For a carb and not FI they we pretty good on MPG for
the 70's. If you got the rear Air Door adjustment dead correct
they were pretty fair on drivability. However not so much the
71 first year versions only 340s. They were recalled and replaced
with the different metering 72 version for drivability issues=
Although I prefer the 71 for the race track if can find them and
the unique jets and other stuff.