Without knowing the offset or backspacing of the wheels, nobody can say what the wheel gap would be like.
I have a square setup but have dropped tire diameters a similar amount (265/40/18), with no ill effects on my V6 LS.
There are some good 35 series tires in 19" sizes. You might shop for those, and then have little if any change in gearing, unless you were looking for that.
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