How do you like the cams? Hows the idle and stop and go traffic driveability? How about power, is it flat at low rpms, like around 3000 rpm, or is it good at 3k and builds from there?
Detonation can be a risk but with decent fuel and less aggressive timing it can work. High revs is what kills most of the supercharged 3Vs. I ran on a stock block for years and typically kept the revs below 6000 rpm and I never had an issue at 480 whp. The rods are the weak link and have a limited fatigue life. Every time you rev it high, it takes a little life away. I think the rod load to rpm relationship is the power of 3. So 10% more revs, is 33% more load, or similar to that.
