my buddy had a 2001 gtp with headers, crazy tune, 3.2 pulley, larger injectors, upgraded ported TB, and E85 and he was beating the 2001-2002 non subercharged mustang cobras. So.....he might have held up to a T/A?
The earlier N/A Cobras get walked by LS1 cars.
I have a 3.4 pulley setup and from a 60 roll, my buddy's lid/muffler LS1 car pulled a car and a half on me...maybe two cars. He runs a 13.4 1/4 and I'm in the low, low 14's...if it's any help to the OP.