You need a attorney. The child support office can and will do what they want until a judge writes his name on a court order to stop it. In most states child support does not stop when the child is 18 or out of high school. it will stop when you go to court.
What zukimaster said. The V-Drive Big Blocks is where it is at. Stock Or mod..... Or better yet get a Runner-Bottom V-Drive if you want to go fast.....