1970 340 intake manifold ??

Hands down, the factory '70 manifold.
The Street Dominator is a decent manifold, but the '70 is better.
I'd love to see dyno numbers to back that up. It wouldn't surprise me much, but I'd still like to see it. The Street Dominator is a really good old school intake. They don't give much, if any on the bottom end.