I wouldn't worry about it. The euro 300d of that era has more pep than the us spec non turbo. My 300d euro would run 100 mph pulling 307 gears, in either fourth or fifth gear. The turbo cars will do about 110.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.