If you have a chance and you can get away with it (emission testing in HI?), swap the intake/exhaust manifolds with yours (I assume the donor is a pre-82?).

You will probably pickup more power without that egr crapola manifold with the butterfly(get the support strut for the manifold too-its different)

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80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??)