I have read , but now can not find it, about some kind of good and bad kind of A/C compressor for my 85' 300D. Can someone help me out with this, I plan to pick one up today.

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1985 300D burning WVO using 26 FPHE, half gallon heated fuel filter,glow plug heater,home made injection line heaters. Home made cold air induction. ALDA full out.
2003 F350 7.3(the last of the great motors)
1987 Paint Horse-non running too, just walks!