There's a bunch of short videos of the resto if you search around the site. Or you can find them all in order on YouTube; https://www.youtube.com/playlist?list=PLUbpK4lLTHhzhaMDOKWmfYbCJapiAMEe7
It seems he has at least a couple 175 OHC motors in the videos. And other than the 3 screw points cover and clutch cover, I don't see an SS motor anywhere. Note the "MV Agusta" imprinted on some cases and external on others. Video "V" shows a "T" motor number at 2m45s and one of the other videos clearly shows a CSTL head with coil springs.