Eddy airgap intakes?
After a glass beeding, wash it down with water, then soap and water and then soap and water again and again. Weather or not it gets blasted under or not.
What offy intake is it?
Most any Edel. dual plane will work great. Not all of them though. LD-340, Performer, LD4B are great examples. The RPM is a bit off the mark for this daily driver.
The Magnum exhaust manifolds, theres a set (Early) that work real well. The MoPar performance books recomend 1 Magnum and one early 340 exhaust manifold to take advantage of the best parts from new and old.
The new Magnum exhaust manifolds have a decent outlet. Look for the ealry unit that has the 2-1/4 outlet.