[Jack21]

Any speed shop will have gaskets that fit Holley square bore. Holley, Fel Pro, Mr. Gasket, etc. They can be trimmed with exacto knife. If push comes to shove, get a roll of gasket material and make them. Can make spacers out of sheet aluminum stock also. Or get heat shield kit, use as a spacer, and cut off what you don't need. Just remember to use longer carb studs, and grease the mating surfaces so you get a good vacuum seal.