but can someone identify this carburetion system for me and if it's a vintage upgrade?

TIA

Single side draft. Could be a Weber (most likely) a Mikuni, or a Dellorto. Can't really tell from the pics. It appears to be mounted on a manifold that is actually an adapter that uses the stock manifold(s). IMO it's vintage but to say it's an upgrade would be a stretch. I've been around these cars since they came to the US and I've only seen two or maybe three of those conversions.