318 Build.. Zero Deck or Stock Deck Clearance?

Then I'll go against the norm. 3 things:
1. It's a street car, so being "street gas friendly" is a must.
2. Your magnum heads will automatically raise your compression
3. Your .030 pistons will also raise the compression
Now, how much compression are you trying to run on the street? I wouldn't go above a true 9 to1 compression with todays gas. I bet you'll be there or above with the components you have now.