What 440 intake?
You know,
The 1967 thru 1969 {#2806178}, and 1970 {#2951736}, and 1971 {#3512501}
Stock Factory Intake Manifolds performed very well in recent 'flow tests'.
Otherwise, an Edelbrock Performer {#2191} is the best avenue for the Street
with A/C and Power Brakes.