I do feel obliged to mention that since John Temple is a "Mark VIII guy," his tunes are likely pretty specific for the Marks. He just hasn't been doing it as long as Lonnie, so more people have the tunes from Blue Oval.
I've been very impressed with John's other work on these cars, and have no reason to believe that his tunes are any better or worse than Lonnie's. I have every reason to believe that both of these will be far superior to any other "off the shelf" tune out there.