Simon, mega interesting read.
What you are saying re the distribution echoes what I was always told, hence the 'log' type manifold with the air getting blasted into the very middle before splitting into the individual runners.
Re the staged injection, I would have thought that pointing at the back of the valves was the way to go too, but would be the 1st to puit my hand up and say that I really don't know that much about it. Could you please enlighten us as to why you feel that this is the way to go?
And finally fantastic work and results. Utterly inspirational to all us 'A' series addics out there and proving beyond doubt what an amazingly versatile little engine they are!
Cheers
Dave