Originally Posted by MarkuzLS1
The throttle body injected 305 is a real dog from the factory. The five speeds got 3.08 rear-end gears and if it came with a positraction differential (which it may not have), it's probably worn out by now. I think most of the L03 cars run in the 16's, stock. Headers, 3" cat-back, 3.73s, and a new differential can put 'em in the 14's.
my buddy had a 3" catback, K&N, Hyperchip (junk), 180* thermostat, stock rear, and pulled a 16.7 out of it
he then got a 90 firebird, LO3, same exhaust, K&N, 9 bolt rear with posi and 3.27's, a 2,800 stall converter, and more handling oriented suspension, pulled a 15.88
you should have a high 15 our of a 5-speed LO3 car, unless you cant get traction