If its mounted in with support screws, then should be either 2 on each front side or the top, once the support screws are removed, it should just pull out enough to disconnect the gas line from it, with the gas off to it first. There should be a gas shut-off lever on your gas valve to shut it off.
I got it out by removing the counter top. The counter top was surrounding the back of the range (since it was a slide-in model). Also, the floor was built up around the range, so this was the only way I could get it out. Anyway... I got it out, cut the counter tops off square on each side so they would fit flush against the new free-standing range, put in the new range, re-installed the counter tops, and it works great. Thanks for your help.
By the way, does anyone ever break down old units like mine and try to sell the parts (like on ebay or something)?