Do a search on this topic as it has been disussed a lot and they will have all the info you need.
DONT BUY FROM EXCESSIVE MOTORSPORTS THEY WILL TAKE YOUR MONEY AND SCREW YOU
I love my kit and I went 12.60 @ 108 with bad valve seals and guides with a 2.48 60ft, I am looking for low 11's this year with the combo below. I also plan on adding a big blower by next year, the kit will love it between the high flowing intake and heads.
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Check Out My Site 91GT,Holley SysteMAX II Kit-Heads 2.02" x 1.60" port matched to a 1262,Anderson N-61,24#,76mm C&L,Full MAC exhaust 1-5/8" Long tubes,2-1/2" O.R H-Pipe,2 1/2" cat back, No A/C or PS or emissions, 12" K&N Filter,RNH PERFORMANCE Ram Air,Ron Davis Radiator,Full Suspension,S&W 8pt "X" brace,JAZ seats,3:73's,Welds..etc,4:30's and 31 splines coming very soon!