I've looked for the, "To Live and Die in L.A." movie script, but the only ones I can find are chopped up. I thought it had a very 'different" type of car chase scene you might enjoy. Al little dated, though.
"Bullit", of course is a classic. And as much as it literally PAINS me to say this, but the chase scene in "The Marine" was well done ...but I can't find the script for that one either.