I guess I’m lost.
Everything about this car says “Kirk and Mary Vintage Speedster” with the usual VS 1600/1915 “impossible to tell without taking it apart” VW T1. That’s really as close as you’re going to get.
We know, because everybody who’s answering has been here forever. In the case of Theron, he started this site more than 25 years ago. He knows what he’s looking at.
Also: the Vintage Speedster you will be driving has almost nothing to do with Vintage Motor Cars, which happens to be located in the same building.
Different owner, different process, different engines.
Good luck with the research.