In a past issue of Volksworld, Mark Thurston's Oval in the UK is using 103mm cast iron cylinders with a T03 turbo to produce about 270hp, with an 74mm crank.
I wonder how that engine is holding up....
Here is a pic from the LBC2racing.com website of his engine .... looks like this is what I'm going to do as far as turbo placement is concerned... another example of BAS header with a turbo.
Sandeep