LPG Conversion?

A company I deliver coils to has 2 natural gas big trucks, the one driver said it runs better than the new emission diesels, I know that's kind of like saying it runs better than this turd but all I've got.
 
I know a lot of guys in Australia and I thought in Scandinavia too, have their classic cars running on LP. Hopefully someone will give you some info. I know it is very doable, but I was pretty certain their conversions didn't provide the performance of our 4-barrels.
 
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