Saving Old Seagulls

Is it worthwhile to get a silver centuary block rebored.I have one that has lay about for many years and bore is pretty rusty .I would like to save it if possible IS it worth doing.

Does anyone have the bottom half of a siba recoil starter.[the bit that fastens onto engine] .I have searched ebay but no joy.I need it to finish my wsl restoration project.

re my sick seagull the impellor is not reversed ,i will post pics of gearbox housing joint when i disasemble it

My centuary plus wont put waer out of telltale, I have renewd impellor,replaced bronze bush and gear,checked inside head its clear,and water flows freely when reverse flushed can anyone help with my problem