I picked up a technocarb carb off ebay for a reasonable price- knew nothing about them or the carb except it would flow big numbers for my 400. So I did my research and am really impressed. Mine is being totally rebuilt by my head mechanic but it can be cause of it's a quadrajet base.
It makes sence that a Canadian company would eventually step up due to their advanced propane delivery and use systems.
If you are serious about a propane build follow mine at the 335 forum under 'dyno this'. I am speeding a lot of time getting as much knowledge as i can to build a motor that others can use to improve upon and you may have info I could use right now.
The second link is actually from alternate fuels racing.
I've got a couple of used propane pieces & an "in-trunk" tank that will have to be re-certified. So, I could propane my 97 Ranger any old time, but because I really don't drive it much, it might not be the best way to invest my hard earned cash.