Low Profile Single Plane Intakes

Aren't truck 5.9 Magnum manifolds a easy swap with lots of flow?

The Offy Dual port may choke your engine. I have a 318 sized one I bought from Summit back in 2000 or so on my '79 360 van. The big port 340/360's were out of production. It worked well with the Comp RV grind and 2200 stall converter. It was done at 5000rpm in a 6500lb shoe box. Is your's the 360 size? It's an MPG/torque intake.