plenty of 4age's running on 1227165 ecus on our forum the dizzy is pretty easy to interface with using a GM 7 pin hei module http://pcmhacking.net/forums/viewtop...lit=4age#p8830 team it up with the 2 or 3 bar aussie modified OSE $12P software and tune away fuel and spark tables to 9600 rpm and 30psi of boost