The wide LSA isn't all about valve to piston clearance. The valve angles of a Gen 3 Hemi are angled at each other and the overlap flow is very good, needing less overlap than an inline motor. The less overlap you need to get the most out of the exhaust energy the better off you are. Look at the duration used for some serious power in these motors. They are a different animal than we are used to. A small block is often happy with a VERY narrow LSA, because the valves are small and flow poorly. The valves are big in the Apache heads by comparison, and at an angle for more cross flow to boot. LSA does narrow up as the cubic inch to valve size goes up, as it should. The 6.4 drag pack cam is a good torque cam for a hot cam, and is on a 110 LSA, but it is also on 392 cubes.
Stock motors tuned for emissions are also stuck with some limits as well, which probably adds to the wide LSA. The bore size is best left at or below 4 inch, and the ring pack needs to be as high as is possible for fuel economy and emissions. Both are going in the wrong direction for VP clearance for a stock motor. The valve notches get too close to the rings.