Imo misconception with "why I can't boot up with BCLK 104?"...Yes, most of the time (if you use) post code reader will stuck @ C1 or 4E and your UD4 will reboot endlessly.... you wasted that expensive LN2
How bout try BCLK 100 and use easy tune 6 in windows (the mobo maker invented ET6 for a reason)...If you use a good elpida hyper based ram and your 2600K can boot up @ 59X then set BCLK 100/2133/59X in bios then use ET6 frequency slider to go up till max benchable setting your system can go.
For now, overclocking SB basically is to find a 2600K/2500K than can go 59X and mobo should be the last piece of hardware that we have to worry about