how close is too close to your tie rod end

I run 14x7 Rallyes on a '65 Valiant and 15x7 Rallyes on a '72 Scamp. Both factory drum setups and both sets of wheels are 4.25 backspace. Under hard right turns, the passenger rim will touch the outer edge of the UCA on both cars. Might grind down the end of the UCA for clearance but for right now I am using 1/8 spacers to eliminate the problem. Wish I had 4" backspace on the wheels.