Aluminum /6

I know they put a few aluminum /6's in 63 Valiants. Did any of them make it into 63 Darts? There's a 63 Dart in the local yard and I'm gonna take my magnet the next time I go, or at least a can of brake cleaner. Back in the late 70's I had a short wheelbase front engine dragster with a 340 on it. The best time it ran was a 9.6 at 168 mph. I've been kicking around the idea of building the same car with a /6 on it. To find one of the light weight blocks would be awsome, Joe.