I guess Ill throw my hat in the ring.
I have run turbos on engines as small as 1.2L and as big as 440 c.i. Pulse timing does have an effect but only on spool up regardless of engine size. Once max boost hits the waste gate opens. The entire system is then under some dynamic pressure and pulses back up and blend. In my experience pulse timing has a negligible effect outside of spool up, and during spool up a ball bearing (BB) turbo will do more for you. As far as log vs headers goes... I found under WOT logs work well, think drags, under throttle modulation, think road race, headers pull harder if your turbo is big and spools high in your power band. I have no experience using turbos for LS but from what I have seen I would assume either would work and BB turbos or pulse timing isn't needed IMHO.
One thing to keep in mind with logs... On one 2.0L I built one cylinder ran hotter than the others. When the WG opened and the exhaust system was pressurized the cylinder with the longest run to the turbo collector ran about 10% hotter. We put exhaust temp sensors just downstream from each port to see it. We built an equal length set to the collector and the hot cylinder dropped to match the others. We have been debating since then just why that happened. Food for thought.
James