Carburetor Spacers

[1969_Mach1]

I need to install a 1/2" carb spacer.  It's on a 351W with an Edelbrock Torker II intake manifold.  I have two phenolic 1/2" thick spacers, one with an open center and one with 4-holes.  I'd like to install the one with 4-holes.  My concern is this, with the open plenum of the single plane intake manifold there is nothing to support the center of the bottom side of the 4-hole spacer.  Does this work okay, or is there risk of the 4-hole phenolic spacer breaking if installed like this? I've installed aluminum spacers like this, but the phenolic is rather brittle.