Army,

i cant add anything technical, other than to say stick with it. you've gone too far not to have it perfect.

retracing the steps of past 'mechanics' is horrible. i had a similar experience with the transmission on the 82.

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car