Well I am lifted 3.5" and running 33x12.5 and I had to trim (a lot of the) front and rear of my front cladding, (see my gallery to see the trimming in rear of front fender) so I am going to venture to say that they will be a bit big. I would stick to something closer to a 31" tire if you can find one for an 18" rim.
I'm not an expert on this by any means, but think your trying to go too big.
2001 Ironman Daily Driver... 3.5" suspension lift (OME912 springs and 1" spring spacer), ball joint flip, 1.5" front diff. drop, 33"x12.5 TrXus MT, 16x10 Eagle Alloy rims, Interceptor, PV muffler, K&N air filter, Alpine Supercharger, Bilstein shocks, and some trimming.
2000 Ironman Project LS-1 VX... very slow progress but someday....... ohhhhh someday......