I have a inch carb spacer/adaptor in my truck. The spacer does work for more low end torque. I had trouble coasting in overdrive without it. Now I can cruise at low speeds and keep the truck in overdrive. I would recommend a swirl hole adaptor for a carb but since you probably have a two hole TBI a two hole adaptor should work just as good. I bought an adaptor for my brother who owns a '94 SWB TBI truck with a Vortec V6. He told me that his low end torque also increased with the adpator. In my truck, i'm removing the factory intake and bolting on a dual plane manifold. This will help reduce backfire the single plane intake causes when the throttle is pressed hard.
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gchemist
1983 Custom Truck
TX Plates: "BAD BOW"
http://www.geocities.com/abetterchemist/