TQ on LD340 or Air Gap

Agreed. Somewhere on the World Wide Web is a picture of the very thing your considering. It did not fit under the hood of my'73 Cuda and I doubt very much it will fit under your hood. Do a mock up and see. I could be wrong here.

I also still have my LD340 and TQ set up. A wonderful dual duty set up.
Have you tried a larger Holley?