Thanks for the kudos!
The source for the base plates and top plates is:
universalspinners.com
his email is
universalspinners@bellnet.ca
416-299-4009
Mike runs the business and is a gearhead. His was the first I found on the internet and he's in Toronto. There are certainly others offering the same product, however Mike was very accommodating.
The Quick Fuels are a little closer-spaced than the Holleys.
I posted this so anyone could consider a similar set-up.
You've certainly noticed I cut 3/4" dia. holes in each base plate to allow the float adjusters to poke into the air filter space. The bottom of the air filter has to be clearanced a little where they sit on the adjusters. A Dremel tool with the sanding drum works nicely for relieving the filter's rubber area.
The spun aluminum top ring is attached to the K&N top filter with clear silicone caulk. I ran 2 lines of the caulk around each top filter and laid the new top ring on the top filter.
Here's my modification for the center all-thread. I put a 6" piece of all-thread in a brake-line tubing bender, made 2 bends to create the 3/8" offset, and then cut to length. I leaned north and south, compared to Charles' north and west offsets.