Edelbrock Carb Spacer?

Turn the carb upside down and lay the spacer on the bottom. Does it block any of the carb barrels? I doubt it does. The spacer does not restrict airflow any more than the carb does. As stated above your Performer intake will accept either a square or spreadbore carb.

Also, if you look at the picture of the gasket that was between the spacer and the manifold, it appears that it was sealing well. I'd run it just the way it was.