An eye for detail doesn't have to be paid for.. In fact I'm tired of hearing the only way to a good build is to buy it. Now, good machine work is another notion; If you wrench, a quality job should be part of your DNA by now. If your confident in your build it will be fine. These blocks are tough. 6-8lb's is conservative. Cubic inches don't add boost.
As it was said before, there IS a difference between RPM and LOAD under boost :D: