Fuelling check under load must be just that ie on the rollers or live map, as it is track car a live map is out of the question, so rolling road will work ok.
A decent operator will pinpoint what is not working right so long as it does misfire when on the rollers, I was having a look around a 500bhp+ cossie on THROTTLE BODIES yesterday, looked very nice it did, was ion for set up mapping etc, that too is a track car from surrey, engine built by ?, sorry can't say, not allowed as owner does not want publicity.
tabetha