67 cuda caster woes

What type of stance does this car have? If it sits level or favors the rear, that will not help your caster problem. Of course, I don't think that's "the" problem but it certainly will not help. Usually you see people have problems with not enough caster when they raise the rear of the car. So if yours sits low in the rear, that could be an issue.

Since you've not bothered to post any pictures, that's just a stab in the dark.