Just caught up with this thread...
Personally I wouldn't let a UK engine builder anywhere near a proper chevy build. I totally agree with your comments re his attitude towards the LT1. Plenty of fast cars running them in the US.
When I had the IROC I intended to import a built engine for the US. They're more experienced, they're cheaper, and they have a better attitude on the whole.
If they have any free time on their hands you'd think in this economy they'd take almost anything on just to keep busy...
It's why I hate dealing with UK companies, there's no "can do" attitude.