I would put it right in with the Air gap.
Another personal experience:
I was in the process of ordering an Air-gap Intake from Ray Barton when he asked me what I was running now. I told him an LD340 and how it ran. He told me to leave well enough alone that any increase that I may or may not have would be minimal and not a cost efficient move.
Not believing what I was hearing I in turn called Edelbrock Tech and the person I happened to get was familiar with the 'old school' LD series intakes. He told me the same thing. Hey, I am still running the old LD340. In fact I have one on the street 360 also.