i know what your problem is, with your popping sound. When you switched over to a carb. in your mustang, you forgot about one important thing. I'm sure it'll make all of the difference. What you did wrong, is you bought a mustang. I mean it's a ford none the less. Go get yourself a chevy, or at least a gm built motor, and everything should work out just fine. If ford is so great, then why did their stock drop to four dollars a share a few months back. enough said.