Welcome to the addiction. I can understand your anticipation to jump on it and ride, but there's a few things you need to consider. If it's had that rough of a life, there's an excellent chance that the crank needs help. Even if the crank is good, you don't know if it's been trued and welded without splitting the cases. If the crank lets go, it will destroy your fresh topend. No matter what path you take, DO A LEAKDOWN TEST, after the motor is back together. Clean the carbs and check to see what jets are in there. Put a wrench on every single nut and bolt on the bike. You don't want a suspension bolt falling out when you're in 6th gear pinned.