Bob, that Ultra dyne may be aggressive on rate of lift. I had some broken spring issues, but then they were K1000h springs, known for trouble.
For the 650 cam I like the idea of a high ratio rocker, as long as it will work at higher rpm. I have thought that this would be a good place to spend money on Ti intake valves and run a stock ratio exhaust rocker to stay with the steel exhaust valves. Even with TI valves, I am concerned about going much beyond about 1.6 rocker ratio. That would yield .693 gross lift, which should work pretty good. A guy can get caught up in spending some $$ on this stuff,but if the reliability is good the investment in Ti valves makes sense to me.