If I understood correctly, the thing you call "ambient occlusion" is called "vertex colors". They can be viewed and edited in Vertex Paint mode in Blender (switch from Object Mode in upper left corner)
Just completed your mod. It's great! I like it! I also found some bugs and oversights: - When Bart is hit with projectiles, his animation is corrupted - After selecting m6 there's no zone loaded behind C-Spanker - After completing any challenge while in m1sd, there's no traffic until arriving to Van...
Mr. Burns, as a big admirer of vintage cars, has arranged a race on cars of 1920's beyond Springfield. Homer decided to take part in it too. Will he win professional drivers of old cars?