it sounds like they were trying to correct a tire pull originally when they aligned the car with the 20 year old tires. now that you have good tires that don't pull, its now pulling due to the way they set it up previously.
the new alignment should have corrected it. it would help alot if you gave us the current specs
you'll want slightly more positive camber and/or negative caster on the left side to correct a pull to the right.
Canadian Marauder
black 300a
JLT intake
SCT Tuned by Lidio
Blacked out Tail lights
FRPP shorties - Mac Prochamber x-pipe - Dynomax Super Turbo's and delete tips
Addco front and rear sway bars
lowered with 1 coil cut
cooling mod
Ford Racing 4.10's
Vortech S-trim collecting dust in the closet