Nice list, seems promising. 4bar your best bet is most likely Xenocron.com they have great prices. And I've always had and heard bad experiences with vacuum blocks, I would suggest straying away from one and just wiring up as you need. It can be made clean as well.
As for your list, i'm not sure if you're looking to be doing a fuel return but you definitely should be, on 1000cc injectors you'll be limited to ~450whp. Plus, you'll be running higher boost due to lower compression. And the best place for turbo pricing is evans-tuning.com they have GT30R's for ~1200.
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