We do not see many of these anymore as most competitors have changed the axles to the 9" Ford type. With that said, the kit sold by Speedway is acceptable. The telltale is the long studs needed to put one of these kits in. During installation I would take pictures and include them with the log book.
I would not want to be a competitor who said he has made changes to keep the axles in and then have one come out. Might be asked to load up on the trailer and not come back for a few years and when coming back may spend a few more hours in the inspection area. Good Luck