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They sell kits for serpentine conversions.

Since you didn't specify, we'll presume that you're talking about two similar engines, with the exception of mfg date...(ie a 350 to a 350, not a 305serp to a 454v-belt)

You can probably use the serpentine set from the 88, on the 81, but what degree of work it will involve I'm not sure.

One thing to keep in mind is that on most serpentine applications the water pump rotates counter-clockwise, so you may need to replace the water pump
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