Yep, the IDI is a lot different. That said, my VW engine is an IDI. So that's a plus.
Post up some pics of your setup if you could. Just curious about your heat exchangers.
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1999 2500 4x4 Club Cab Sport.
sorta functional ADRENALINE/
pulse 
, BHAF,
FBD 150 sticks, 3rd Gen HE351 retrofit, Hamilton 110lb valve springs, A1 head studs, 5" FBD exhaust, Isspro Boost and Drive pressure gauges, fuel pressure gauge, FP light, Mallory Comp 250 pump, 1/2" big line kit, Draw straw, TC lockup switch, Stealth VP plate, BD TC, BD VB, Billet input, Derale pan.
462hp and 920ft-lbs 11/14/09, I know I can get 500hp...