Chevy G20 – Basic questions before purchase (LPG, taxes, etc.)

Hi, since I am completely new here I introduce myself first: I am the Max, living in Bavaria, am 18 and musician. Since I need a very big car for my band (i.e. rather a van) and I do not like modern plastic slings at all in contrast to my peers, but on V8 Amis, my choice now fell on a Chevy G20. I don’t have a certain one in mind yet, year should be so 86-91, LPG MUST be because we will be touring a lot, otherwise s should it only be able to be prepared with acceptable financial effort (everything is done by myself, my dad is a car dealer and mechanic and has great contacts in the direction of when he doesn’t know what to do.) So in advance, I’ve already experienced a lot through the SuFu but various questions remained unanswered or unclear: 1. Is it no longer possible to convert it to Euro 2 by KLR from a certain year on? 2. Are there gas systems that make the conversion to Euro 2 impossible? ? 3. If I have a gas system, how much fuel does the van need about every time before switching to LPG? That would be the most important things, more special might come then if I have one or more more closer in the eye. Finally, I just want to say that one should not conclude on my ability to deal with such a part because of my age, if anyone should do this here ;] I know very well that an old G20 requires extremely much care and work and often Pro bleme can do as some other car / van, but that’s exactly what I think is part of it… I’m just born in the wrong country and 30-40 years too late for cars :[ Greetings, max