Wheel/Tire help

Ok so measured the rear to figure out backspacing. Looks like I have 6” from the inner fender to the outside lip of the hub.
I have 5 1/4” from the lip of the hub to the inner lip of the rear fender.
My 14” Rallye wheel has 3” of backspacing and 2 1/2” front spacing.
Do these numbers seem correct?
Still debating on 17” or 18” wheels.
I want a tire that fills the wheel well but won’t have clearance issues.
Also, will the sway bar in the front play any issues?
I’m not sure how to measure the front for fitment.

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