If you change either the wheelbase or the track you should
check/change the Ackermann angle of your steering arms.

While the car will steer OK if you don't change the Ackermann it will
be better if you do. And your tires will thank you too. Even my riding
lawn mower that used to push the front end when turning steers great
after I corrected the Ackermann. ;-)

I have three articles on my website of how I corrected my CMC built
Locost 7 steering geometry. You can access the articles from the
"links" are located at the bottom of the home page.

The address is;

http://home.comcast.net/~olrowdy_01/