IO540 A Personal Title
Join Date: Jun 2003
Location: England
Posts: 8,100
It was about £6k for an IO-540 a few years ago. And that was done by a well known cowboy (since gone bust) in the UK. It's really hard to find a reputable engine shop in the UK; I would send the engine to a specialist in the USA.
I would recommend Maclaren and Nicolson ( Spelling) in the UK