Yet another comparison (air-gap carb spacers)

Put the air gap back on. Decided I'd port-match it before the 3rd reinstall. I usually run a 1" open wood spacer with the AG. I have a 1/2" oval split spacer I want to try out to see if it jives better with the split manifold design. I've read a lot of 'talk' about the differences, but no actual numbers. I'm going to track test the two spacers to see what happens. Anyone else do this comparison on the track or a dyno? I'm interested in just the open vs split spacer.