Taller tire is probably better (the stock ones are pretty skinny by modern standards) -- there is limited clearance in the front fenders at full lock.

You could always get the rear end out of a 4.5 instead -- just remember to get the speedo gear, too.

Peter

__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!