I bought a shell and tube heat exchanger from e-bay. Can any one tell me the best way to install it on a 1985 300sd.Thoughts and suggestions welcome.

Perhaps you could elaborate on what you want to use it for.

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green 85 300SD 200K miles "Das Schlepper Frog" With a OM603 TBO360 turbo ( To be intercooled someday )( Kalifornistani emissons )
white 79 300SD 200K'ish miles "Farfegnugen" (RIP - cracked crank)
desert storm primer 63 T-bird "The Undead" (long term hibernation)

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I blend my fuel and I want to heat it up with the heat exchanger before the injection pump. I want to make sure I get it tied in correctly

Is it a shell and tube or concentric tubes (hose-in-hose)?
A shell and tube would have a small tube running back and forth a bunch of times inside a chamber (the shell), in which case the fuel would go through the small tube and the coolant through the big chamber. In a HIH, the fuel goes in the center tube and the coolant flows in the outer tube in the opposite direction of the fuel flow.
Good luck.

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1985 300TD-euro 352,000 mi
1974 240D (1?)52,000 mi - has a new home now