If he did a cowl induction intake like figure 10-b found in this document
http://aerade.cranfield.ac.uk/ara/1950/naca-report-982.pdf he would get most of the ram air benefit and only ingest 5% of the water of a normal ram air scoop. This is exactly what Mercedes did on my 85 cali 300SD.
Edit: What are you doing to draw vapors in from the crank case? (Note a vacuum (even a slight one) in the crank case helps power on the top end.
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green 85 300SD 200K miles "Das Schlepper Frog" With a OM603 TBO360 turbo ( To be intercooled someday
)(
Kalifornistani emissons
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white 79 300SD 200K'ish miles "Farfegnugen" (RIP - cracked crank)
desert storm primer 63 T-bird "The Undead" (long term hibernation)
http://ecomodder.com/forum/fe-graphs/sig692a.png