edelbrock won't seal on 318

How are you tighening the intake down?
Start in the middle and work your way out.
Use this gasket on a 318.

http://www.summitracing.com/parts/fel-1243/overview/

Use copper spray on the gasket surfaces, good thick 1/4" bead of permatex black on the end seals, let everything sit for about 15-20 minuates.

Make damn sure you set the intake on square, and use teflon paste on the threads.

Let it sit 24 hrs after you torque it down before adding antifreeze.