Holley SysteMAX II kit $2100 well worth every penny, the head issues have been fixed. I did go 12.6 @ 108 with the full kit in my full weight 91GT.
Swapped cams to a AFM N-61 and lost a little weight going 11.90's. I went 114.9 on the stock EEC, still tuning on my Speedbrain for max power but all my 11 sec runs have been 112.9mph. My car is a 302ci stock internals, has 8.8:1 compression with the 63cc chambers and the thick ROL gaskets and fly cut pistons, with the 4:30's that the cam is ground for I am looking for 11.40's.
I also recently swapped to a 75mm TB and 30# inj since the 24# were going lean up top
I had been running a 65mm TB and 24# inj.