Late model dakota durango sb manifolds are rear dump and flow better than stock but you'll need to alter the inner fender and firewall with a big hammer and shim mototr supports too. Nothing fits the a-body like a-body manifolds.
why pound on the inner fender ??? are they that much fatter ??i would think these would be a better deal on an early A,, and if you had to dent the fire wall,,still better then the orignals,,,