Here's what I did....bought a K&N X-Stream air-cleaner assembly, found out that with the nicely radiused K&N base there was not enough clearance. I had been using a Mr. Gasket air cleaner that was shorter, so I used that and here's what I came up with:
It is possible to get a shorter K&N 9" cleaner element...which would give additional clearance.
One of our members (sure wish I could remember the name) used some flat aluminum stock to mill out a plate for his Holley, but I am using an Edelbrock carb and the choke mechanism would have interfered...if you have a Holley perhaps you can find his thread. IIRC he had a few milled up and was selling them at cost, perhaps he has a few left for sale.
Good luck....much as I hate to do it, I think I am going to have to lower the engine in my Cobra replica to get the intake system I want to fit.....
Cheers!
Dugly