Edelbrock performer RPM crossover

Anyone either found gaskets with the crossover block or come up with a crossover block of their own? I have the RPM (not the air gap) and am not interested in keeping the exhaust crossover but can't find any gaskets that have the crossover block in them. I'm thinking of cutting small pieces of sheet metal to block them but not really sure of how much pressure goes through those crossovers. Any information would be awesome! Thanks!
 
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