I'm begining to think my car must be the fastest 300D (up to 1985) around by most of the posts I see. It accelerates as good as most non-diesel vehicles I've driven, has no lag before the turbo makes boost..... it wasn't like that when I first got it but with proper tweaking it's great. Back to topic, I don't think I'd want to drive a wagon anywhere with much traffic with only 85-90hp. Your best bet would be to swap a turbo TD engine in if the rest of the car is in great shape.... or find one that's already turbo.

__________________
1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k