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Jegs and Summit both have them in a variety of thicknesses.
Stay with phenolic for heat insulation and avoid aluminum.
Also, make sure you have long enough studs to accommodate the increased height. Summit and Jegs both sell the longer studs.
Finally, make sure your fuel lines are kept out of heats way as much as you can too. Also, make sure you have hood room to add the additional inch of space under the carb. Shouldn't cost more than $50 altogether.
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