Intake gasket for a 1973 cuda 340

So changing my intake and do not want the heat crossover that the edelbrock performer has. Heard that I should buy the felpro gasket 1213 without the crossover and block the crossover with thin sheet metal.

How is this done ?

Also anyone use Felpro 1213S3 laminated core with printoseal ?

Thanks for your help.
Author: Ralph