ok, just got back from looking at that other 300D, and this is what I found:

Mine: 1980 300SD
617.950 engine
116.120 chassis
(I can't read the IP number)

His: (door plate says 76, everything else says 78) 300D (non-turbo)
617.912 engine
123.130 chassis
IP numbers: 350/2200 MW19
PES 5 MW 55/320 RS 15

The shop manual says that in 1980 there was no such thing as a 116 body design?

My main question is......Can I put that IP pump from his onto mine without any engine damage? With there being a turbo, will it lean out or just generate less horsepower?

Then I can determine how strong of a runner this car really is.