massimo, just called me to thank for the info you all forwarded.
from what i understood he is building a race 500/4 to parade only, but wants to make it a sort of replica. the nice bit is that carlo murelli from Samoto in Rome, the only non japanese engineer who ever worked on the NR500 is building his motor.
he must be pretty old by now, like close to 80. back in the 70's he was regarded as the top 400/4 500/4 tuner in italy, nice to know he is still building stuff
TG