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Although LS have their own share of serious flaws, like dying from valvetrain failure when fitted with a cam without serious work on rockers, pushrods, springs and so on, or when revved slightly too often near the rev limiter even stock, or not being able to take some Gs without oiling problems, i would not bother swapping a VQ. There really is no point. A VQ will do around 300hp tops A CA or SR will do the same, stock. The gearbox will be at its limits, true, but then you can put a VQ gearbox in it. Heck, for the price of a VQ swap you can put a sequential dog box instead.
VQ rods are weak so you cannot turbo them without building them. It makes no sense to use one, unless some rule states you can change the engine but only take another one from the same manufacturer. That and they take up quite a lot of room being DOHC.
Want turbo LS ? go cast iron truck block. Want NA power ? well ... aluminium blocks have become expensive and cannot be rebored, so you might regret that weight saving aluminium thing the instant you drop a valve (because it will happen, unless you source an LT from a C7 corvette. Even then ...), but either are valid choices.
With a nicely built valvetrain, a cam, an LS Next block from dart and dry sumping they will reliably make a ton of power.
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