I would suggest that you try to keep your tire widths as close as possible. 255 on the front and 305’s on rear will just give you under steer (I run a similar setup on the street strictly because it looks good). For a track/street setup on stock wheels I would run 275 all around.
And you don’t have to worry about tire diameters on a square setup. Although, your speedometer may be off. My track tires are 245/35/18 all around (6.85% smaller in diameter) and I have experienced no issues.
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