[MaSnaka]

I am not familiar wit A&C, but many cars use the Mustang II front suspension. Does yours? My front would rub in moderate-hard cornering and especially on bumps or dips. I replaced the stock front a arms and used coil over springs and shocks. I found the original springs were way under rated for the front end. I now have 500# springs which carry the front end nicely.

Is it possible your springs are too light? BB with Small block spring rating?

You could swap (r-l and l-r) your coil overs to the other side and see if the problem remains or migrates to the passenger side.

Possible your anti sway bar needs some adjustment.

Do you need a different backset on your wheels?

I don't know for sure just throwing ideas your way that might help.

Good Luck!!
John