There are companies that supply complete instructions and critical special parts. Do it that way and you will have a much better product. Do an internet search and you will find more than 1. Folks have been doing this conversion for 30+ yrs. Depending on your skill level/knowledge set you will get something really special or a pile of rubbish.
If you don't have a $2500 min budget, forgetaboutit. It will just break your heart.