Jonnie
I have seen this car , both in the past (at le Mans Classic in 2008? where they stayed at the same hotel as we did ) and more recently at BHM (way before lockdown.
It is a neat and tidy car to look at certainly, I have not seen it up on a ramp and had a look underneath.
Sorry I cannot remember who did the engine work , but the installation is very neat and tidy and has obviously been done professionally , not an amateur bodge job. It looks like someone has spent quite a bit of money on it .
Regarding performance again I cannot comment, we overtook it in our +8 on the way from the hotel to the track at Le Mans fairly easily , but who knows if he was trying hard at the time , and I am not known for hanging about, so you cannot really draw any conclusion from that.