Veedub, there's another article there describin the pros and cons of different cylinder and crank setups, as well as other "internal" mods. Check
http://aircooled.net/gnrlsite/resour...es/t1hpeng.htm
And i also want my engine to be as reliable as possible, and i've read that the 2007cc combo is very reliable if properly cooled (i'm planning on an external oil cooler, and running 8.5:1 CR)
Sorry I meant 40x35.5 valves, and for what I've read Steve Tims makes a set of heads that's both excellent in performance and reliability. You will need all those valvetrain stuff (dual springs etc) for the hot camshaft, for reliability and to prevent valve float at high RPM.
It seems to me that you were looking at cb's heads, their 044 castings are said to be very reliable. Remember that they also must be ported and polished, there's no point on using big valves on a stock port head, if you can get a p&p'd one.