Don't know about the shift kit but I'm going to lean on the side of no. There's members with turbo and auto 4g64 trannys that are stock and you're only going 5psi so I'm pretty sure the stock tranny can take that.
Skip the TB spacer, doesn't doing anything plus the stock 4g64 intake manifold you have likes to break right near the throttle body so I would avoid extra weight/material in that area.
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