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I've got a set of doug throley tri Y headers for your truck for sale on another forum.

I've never seen a tb spacer for that truck. Your very limited on power adders for that truck,I would convert it to a magnum or put a cummins in it. The magnum swap is not to bad on a 90 or 91.

If you can maintain steady RPM (the lower the better) with the air cleaner on spray carb spray around the base of the carb and where the intake meets the heads, If the R's jump you have a vacuum leak.