JET chips are a waste of $$. Snake oil

I'd go with a hand-held tuner from Bamachips or Brenspeed.
Cheap eBay turbos are WORTHLESS!
That seems about $100 too low for a good T3...I'd avoid them and whatever ssautochrome's eBay name is now. They WILL break and junk your engine.
No offense, but if you have to ask what to do to install your own turbo, you probably can't do it. You'd have to be a good mechanic and/or an experienced fabricator to even start in on it. Hell, I could do pretty much everything but my welding skills arent up to it so I'd be hesitant.
There is a turbo kit people on here have used, it will make your V6 FASSST. About $2k but it gets you 400hp IIRC.
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66 coupe 5.0/T5, home-brewed power 4 wheel disc setup, 350hp+, looks like it belongs in 1968