I imagine there;s a 1600 injected lump going in?
You imagine incorrectly.... although that's a nice prospect and may happen at some point when one is sourced for Cheap.
What you're looking at is an SU carb, on a Bodgit & Scarper manifold.
The can contains Start Ya Bastard stand-in, to aid tuning of the carb.
It smells, as DannyP put it - of toilets, but is extremely flammable which is nice.