The stock pipe on your 427 is a .063 clone. That is all about torque and if you put it on a buggy with any Nova motor your going to get a lot of wheel spin.
Get a JP-3 and call it a day. If you are on a budget get the Dynamite Platnium .053 or .086. You can not beat them for the money.
The .053 for a small track and the .086 for a big track.