edelbrock heads on a 318

The right head for that application would be our Magnum Iron 318LA head
60cc combustion chamber, as CAST La bolt pattern, 235 CFM at 28 out of the box.

More Tech info here:http://www.4secondsflat.com/FBo_EQ%20Cylinder heads.htm

Trust me and the others here, that Eddy head won't help you at all, it'll kill all your bottom end tork and IMO it's a poor choice for your moor and most other applications, for many reasons.