I was told that my 1300 xflow is a 1300GT engine. It has the GT inlet manifold and twin choke DGV Weber. As the Gemini is nearing SVA I've started thinking about some light tuning as my first post SVA project. Is there anyway of telling if I have a 1300GT head or a standard 1300 head as this would be my first upgrade if it isn't.

I seem to remember a site somewhere that showed/identified the different xflow blocks and heads. I have a look.

Your first move would be to get a 1600 x-flow and swap them... I held out with mine for a while but it made a huge difference when changed...