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it depends on what you want. Looks like a fairly complete kit. However do realize that it's almost a 1000$ and that shipping from the UK is outrageously expensive..check out http://www.interparcel.co.uk.
As for the set, the turbos look to be saab or volvo T3's (other T3s usually have a flange inlet instead of a hose connection, like the ones used in chryslers) they have a non adjustable internal waste gate so you're stuck with what they're set at. The T03s will work on a 350 but barely, they are a little on the small side if you want to make huge power. These have .60 compressor housings, I think the stock volvo stuff had something smaller than that (below .50 AR) so they will do a little better but certainly won't put out a lot more than 400/450 HP or so and that's stretching it.
I have no idea why it has 2 bov's...the tpi only has 1 throttle body so 1 bov close to the tb would suffice (and be the best setup), it'll balance out both sides and no need to adjust both bovs to the same setting, bovs should be mounted close to the tb anyway.
1000$ is not a lot of money for a turbo kit that complete, if you want a turbo charged car w/ decent power that may very well be a nice kit for you.