I dont know why everyone is acting like an afc is something bad, for a 240,Eclipse,Srt4 things of that nature they work great....

And making it run rich is not going to hurt him and cause it to blow up, if anything he just made less power,safer by being fatter.... But its probably minor changes to what you had... best thing is to get a wideband, datalogger etc... and take your time doing it...