A magnum 318 would be a cam and intake swap. An LA 318 like the one you spec?
Here's one build but I don';t think the 302 heads are a solution unless that's what you already have. I'd swap magnums on before I spent a nickle on 302 heads.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
