I never had a problem with my Paceys, no coating, until the wire retainer broke and the loom fell on them

But I've got an EF loom now so it doesn't matter
In all seriousness though, I do not believe, provided the wiring/hoses are tied up properly, that you will have any issues.
Alex
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Proud TQE Operator and President of SEFAG - the Society for the Elimination of Ford Automatic Gearboxes

Pacemaker headers + 2.5" exhaust
EF Fairmont interior
MP3 player
Lowered King springs
5 speed manual
EF motor
Newest mod: EF Ghia wiring loom and dash