Through my years of racing and research I tried a lot of cams and worked with Ron Wood a little. A lot of my info came from CR Axtell through my friend Ken Canaga. I tried the 4s the 2s, some Axtell cams and the Norris RX (same as Megacycle 560 NSS). They are all very good cams. The Axtell #3 is one of the better cams for with 750 good mid range. Its close to the PW3 and the Megacycle 560 NR is a copy of the Axtel #3. It has a little more duration and less lift than the PW3. Which means you can rev it a little more without valve float (up to about 8000 RPM with R/D springs).
http://www.britbike.com/forums/ubbthrea ... ber=282158
Ron Wood got 84 HP out of his short stroke 750 back in the day. Norton didn't believe it and flew him & the motor to England to prove it.