I would think they would be possible with a couple more upgrades. I went a best of 13.28 @ 104.8mph on BFG RADIAL T/A's 255/60/15 with pullies, ram air w/ K&N, 1.7's, all the free stuff tps @ .98, timing at 16, fuel at 38psi. I had Full length 1-5/8" MAC headers, 2.5" Off roads and cat back. I had 70/30's, 50/50's, SSM lowers Eibach drag launch kit 9si in bag, 3:73's, removed front sway, Pro 5.0 Shifter, CF DF. That was on a 1.9 60ft and .518 light. When I bolted on my M&H D.O.Ts I went a best of 12.87 @ 103.9 on a 1.601 60ft, .501 light. Everything listed above is what the car had, nothing else, stock untounched heads, cam, intakes etc... oh and it had 167,000 miles. FULL WEIGHT GT with a 4" Cervini's hood.
If you can get all the power you are making to the ground you can beat cars that have a lot more HP, but a lot resides in the driver.
Boti Why are you going with a 28" tire, you will hit the ground effects on the front with those tall tires. A 26" tall tire will work fine for you, I plan on running mine with my 4:30's hitting the traps at around 6200rpms, if I need to drop the rpm I will go to my brand new 28" ET DRAGS I have sitting down stairs. Good Luck in your quest it can be done. I know I use to piss a lot of guys off at our local track when I beat them and they couldn't figure out why since they had $3000 in theirs motors, it's was driver and I was getting all my ponies to the ground, thats the whole deal. I do admit I was getting good mph out of my stock motor I guess it had been put together good from the factory.
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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!
[This message has been edited by Rick 91GT (edited 04-15-2001).]