Nop do not run them 305/45...I've seen them and they are waaaay to big...they will the speedo, anti lock brakes and rar gear ration will be deduced significantly. they are 28" tall. I'm not sure the 308/35 will clear the rear exhaust.
on the 18X 9...they may be some people that run them but my reccomendation would be 275/35 all the way around or 275 rear and 265 front. Here's the 285/35/18 rear on 10" wheels and 265/35 on the front on 9". you may get away with 285 on the rear with 9' but not on the front...if the car is lowered they will rub. the 275 were very very close on the front with 18X9. I later switched to 265 to clear coil overs.
GI joe