In my humble opinion (my Cortina used a lenco with its former owner) with a lenco you NEED a spool. In a strip only car, why a soft locker?
My Tina was originally run with a small block/Lenco, and a spool with 14x32W tires.
How much tire are you using?
And I agree, step one is making sure the rearend is square in the car. Second, there are threads here and FBBO on tuning caltracs. Shock tuning is something else to explore, different settings on each side, maybe? You need tnt time.
With a 1.8 best with a ten second car, you have a long ways to go...... 1.8 is a slow twelve second car 60 ft.
