I've had my PV up to a tach-indicated ~123 mph. The speedo is useless in my car, reading roughly double what it should (well, I DID fix the odo when I had it apart!), but the tach can be trusted. That was at 5500 rpm in OD, and it was still pulling pretty well at that point (with the VV-81 Isky cam the engine is just enteering its strongest RPM range at 5000 - 5500 RPM).

Oddly enough, I think my PV feels better at that speed than I recall my 1800E feeling at 110 - 115 mph. The PV sort of feels hunkered down - steering is still weighted normally. The 1800 starts to feel lighter in the front end. I put an IPD spoiler on my first 1800E which largely cured tht, however.

I'm not sure of the aerodynamic differences between a 122 and a PV. The 1800 obviously has a sleeker shape (more slanted windshield and back window) and less frontal area. But the 122 and PV both have lots of straight up and down front surfaces. The PV at least looks taller, and I have my doubts that its tapered rear end really does much in terms of reducing drag.
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I'm JohnMc, and I approved this message.