need help choosing right intake manifold gaskets, for ported heads.

[dbmx66]

okay so i have a problem, i got a new dart intake for my engine, and i accidently tore my old intake gaskets while taking the old victor jr off. i forget what part number they were, they are fel-pro ones. the black ones with the blue rings.

but anyway. i used my dial caliper to measure the ports on my heads. and they dont make a gasket thats exactly the size. question is do i get the ones that are slightly smaller, or the ones that are slighty larger?

thanks.