Love the rims Vargen! Those are exactly what I'm after but I'm not sure on the back spacing ??!! I don't want them sticking out, do you have throes specs??
My bet is the offset is +14 mm. We have Boss 18x9s with 245/45s and Hotchkis springs all the way around on dad's 81 Camaro and they fit perfect. We installed 3/8" spacers at the rear just to give a slightly more muscular look and make the Z28 body kit rear wheel flares look more useful. Plenty of room for more tire at the rear but dad insists on being able to rotate his tires.