I've converted a few Skylines including the monster twin turbo models, few years ago though.
Edit - You didn't ask about Skylines (straight 6 engine)
350Z V6 Wouldn't be a problem.
Lukie (beginner I think?) did one last year. Andy Evans has done a few, no doubt Andy's are tidy and drive properly on LPG, he's got a vid on Youtube of one of them.
Thanks for info.
My jag is still running fine on lpg but has now got a gearbox fault so I thinking of replacing it with a nissan skyline 350gt which has the same running gear as the 350z.
I understand this engine is muilt point injection so looking at removing the jags system and fit it to 350gt. At the monent trying to find out what the max bhp of landi rg1 vaporizer is.