Thanks to y'all for the replies - some great info here!.
We've gone back to square one - checked the carbs thouroughly and got a bucket load of jets. Our current thinking is that the hole in the power curve is so extreme there are factors other than jetting involved as well.
The first is that to measure the A/F ratio, we ran with the end-plates off the Super Traps to insert the O2 sensor and that the lack of back pressure will have a significant effect - so will have to modify the headers to insert the O2 sensor :-(.
Some have commented that a big fat spark from a MSDI can help significantly. I have actually built an MSDI with an in-car keypad to modify the advance curve to whatever is required. I wanted to get a baseline from the stock ignition before proceeding with this - didn't want to throw a spanner (er... wrench?) in the works without having a known point from which to work.
I'll post the results of our further dyno tests to (hopefully) add to the knowledge pool.
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