I'm going to take a stab in the dark and say TS has a squealing belt issue and thinks a Gilmer drive will help. I've never been a fan of just tossing money at a problem so if i'm right about the noisy belt, give this a try: A) Tighten the belt B) if the belt is tight and still makes noise ensure it IS the belt and not a something else. With the car off, take a bar of soap and rub on the pulley contact portion of the belt. Start the car and if the noise doesn't stop then you have another problem. If the noise does not stop and it's not a pulley then check the belt alignment. If that is good, try a narrow(er) belt that fits in the pulley groove a little more snugly.
Restoring a 65 Mustang i've owned since i was 14...don't ask how old i am now.
Just keep in mind fan-to-radiator clearance when going with something like the Gilmer due to the width of the belts. Clearance is already pretty tight with the standard belts. You can get gilmer pulleys for cars with power steering, but they essentially have a v-belt groove at the back of the cog pulley to accommodate the PS belt. I don't think you can use these on an A/C car though.
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