I made pretty much the same modification after first reading this thread, but I used a Goldenrod Water Block spin on filter from Northern Tool.

IIRC, less than $20 for the unit with a filter and then less than $10 for a spare filter.

If nothing else, a little peace of mind. If there's any down side it's that I now have another spare filter to carry around with me.

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Pictures of the MB: http://s230.photobucket.com/albums/ee41/EricandRobyn/1981%20Mercedes/

1981 300 SD with a Goldenrod water block and Injetor line heaters. EGR is missing

1999 F-350 with HP X-over, Dahl 100 Fuel Filter, Coolant by-pass filter, CCV mod, Tymar intake.

Both on single tank WVO blend