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I'd just use a flood light or heat lamp, a heat pad won't do much, you want the heat transferred thru conduction (best), radiation 2nd best, convection worst. Any light bulb with a reflector will get much more heat into the oil plan than a warm pad on the floor.
Borrowed parents 79 Bonneville years ago in the middle of winter for a few weeks, it didn't like to start in the mornings, used a 1-200w work light under it's oil pan outside and never a problem.
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