the problem you will run into is the intake has larger ports then the heads and there is not realy a way to safely gasket match the 318 head with out makeing the material around the port on the head to thin. I used this setup as it came off the motor and it was ok, but I would wadger that I was not operating at the full potential of the motor...when I had the motor apart last week I just put on an aluminum intake and was done with it.
I always use the 360 felpro intake gasket...it is larger and paper instead of metal. I hate those stamped gaskets. also I recomend using a thick bead of high temp RTV instead of those cork pieces also...