I kinda feel the same way as Matt BUT my only point to add is either engine you go with, a solid plan should be made and time spent in the garage to maximize time on the track. Joe (rags) always told me one thing at a time when I built my cars and in a rush to always want to be at the track, I didn't enjoy the car as much because "something" would be wrong so I hated working on the car because it took time away from driving it. if your current setup (engine) meets 80% of your HP goals and track duty then stick with it since you know what you have and the time spent. If you NEED more, and have a great punchlist and plan to do the LS3 which if you believe will help you "work less" on the car to enjoy it more than go for it! Just thinking this past this year, you have a buyer right now for an engine I believe if gives you a problem again within the next two years, you will sell it. If you moved to the LSx and any issues came up, I don't think you would be on the fence to sell it and move on to another platform. I am trying to come at this without money being an issue just plan, what works best for Mike to have fun.