Turn radius to the left

You’re going to have to inspect for interference when you’re turning the wheel so get a helper to turn the wheel while you look for what it’s hitting.

You mentioned the fast ratio steering arms. If you have headers installed, I can almost guarantee the pitman is hitting the header. On an A-body the fast ratio arms interfere with pretty much every header currently available.

Another thing to check is the lower ball joint bolts. If they’re new they may be too long, and acting as the steering stop against the lower control arm when turning. That would effect both sides unless different length bolts were used side to side though.