Can't get around it, underdrive pullies are your best bet for the price range you state.
An aftermarket coil won't do much if anything for your ET and with such low mileage on the original, I wouldn't bother.
A new PRO 5.0 is around $200. and a good investment, so I would still consider it.
Again, not a huge et drop with it, but it could drop a 10th, compared to the factory shifter.
With the '89's low mileage, 3.55 gears and the few mods you now have, low 14's should be easy. Underdrive pullies would have you there for sure and possibly high 13's with the shifter and a good tune-up.
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