That car will easily to 120 all day!

You need to fix the pressure line -- runs from the intake manifold to the switchover valve to the ALDA and then to the transmission amplifier. Need to have the little clamps on ALL the connections, else it tends to blow off. You won't get full boost unless the whole thing is pressure tight. There are some interconnections with the second switchover valve on the firewall, too. This is the cold running shift softening setup, so the tranny won't bang when cold

Should get you 0-60 in about 10 seconds running well. Milage is in the 30-32 mpg range, usually.

Fix the rest of the vac lines, too -- rubber connectors will be shot, it may also have serious leaks at the recirc valve and EGR actuators (both of mine are blown). The air recirc will reduce part throttle turbo lag and should increase highway milage since it cuts boost at light throttle. EGR can be left disconnected, but if you use synthetic oil won't cause any problems, and actually reduces combustion temps and heat load on the cooling system at part throttle.

The W124 300D is one of the bets cars MB ever made so far as I'm concerned!

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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!