Well I fit the wider PG tires on it by sanding the inside of the fender wells. I wanted to preserve the stock look.
Most of the photos of classic NASCAR showed the cars with the full fenders.


Not all, but most I see did and that's how I wanted to keep them.
Anyways, regardless of that, here was my approach.
First is to sand the outer edges of the chassis to allow it freedom of movement for float.

I also took out a lot in the rear.

I also removed the brackets, but added some shims in the rear. I don't like the "lowrider" look that much so I stacked some SCC axle shims to get the rake effect I liked.

You notice I also sand the tops of the chassis mounts flush to remove the lip. I do this on ALL Carrera models. It's sometimes a tight fit for the body post and can bind the body, preventing body float.

Did the same up front. Yes, I did a guide mod as well. Some like to, some don't.

Not pretty, but it works. If you take the time to look at your body, you will notice how thick it is. I used a fine grit sanding drum in my trusty DREMEL and took my time thinning it down on each side.

It allowed the wider tires the clearance it needed.


Anyway, more than one way to skin a bowtie eh? :) Hope it helps.