mk e wrote:
Are you planning transverse mount or it sounds like maybe longitudinal?
I have 18x10.5 on my car....I moved the lower shock mounts inboard 1.625" by welding on new ears, then clearnaced the a-arms for the new shock position. A 285 tire fits, a 295 will probably fit, a 305 MIGHT fit.....this is without removing the inner wheel well.
So hurry up and finish the crane already!!!!

I've been playing with my Fiero... and with nothing but 1" thick wheel adapters, it mounts the 18x9.5 rears from a C5 Corvette with 285/30-18 tires. I have a C5 ZO6 18x10.5 rear to experiment with, but I suspect with just relatively minor mods to the struts, that will be able to fit with maybe a 315/30-18... under stock bodywork.
I've been wondering about moving the Ferrari rear shocks down in between the arms like the front ones... maybe even double up if there's no good place for a single... That'll result in plenty of wheel clearance, right?