Yep, we have that one two. Also anybody else conflicting who requests a level in such a flights block has priority over the guy in the block.
No block levels in E airspace has be sold to me in the past by "crivens, this could put an IFR at a VFR level, and we'll all be rooned". On the other hand your AIM table of cruising levels seems pretty restrictive for IFR aircraft in E, so I'm surprised to hear block level clearances are OK.