Thanks for the feedback. I just test drove it, goes like a rocket - comparatively. The owner claimed to know very little about it. He said it was an original twin carb 1776 cc motor. My reading tells me this was never an original spec, especially as the carbs looked vertually new. No engine number either, not corroded or warn, just missing.
It did drive very nicely, but I'm a bit uncomfortable about the lac of clarity around the provenance of the engine. V5 says 1773 cc and doesn't list any modifications
Can anything further be deduced from the image of the engine?
Many thanks