I doubt it its possible in a 300D unless you eliminate either the mechanical fan or the AC condensor.

I installed a customized intercooler in my 2000 Dodge Dakota CUMMINS 4bt, 4x4, Crew Cab. It's visiable in this pic:

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daw_two
Germantown, TN

Links:
Sold last car --- 05/2012 1984 300D Light Ivory, Red interior
No longer selling Cluster Needles Paint
No longer selling New Old Stock (NOS) parts

Past:
3/2008 1986 300SDL "Coda"
04/2010 1965 190D(c) "Ben"
& many more