I don't know if I'd be running a 606 on WVO. They seem more "high-tech and precise" to me. They also seem like the would cost $$$$$ to fix say when everything starts to coke up.

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1981 300 SD 213k miles "Stock for now"
1999 Super Duty 7.3L 113k miles
1981 300 SD 180k miles "Heavily modified" SOLD