You're right! There is a lot more deflection to the shaft of the Hi-flow. I like the looks of that 4 window PV. I have .092 PVCRs and could not get it to richen up any more with the 80 mains that the cruise likes. It was plenty rich with 88 mains.
Holley offers the Hi-flows in several openings from about 3.5 to 9.5, give or take.
Now I can get back to tuning. Thanks to everyone for the help on this!