I used the trans-dapt mounts on my '70 dart. Went from a slant 6 to a magnum 360. They fit great and cost about a 1/3 the price of the schumacher stuff and look pretty much exactly the same.
Poster may not realize that the earlier year K frames differ from the later year K frames and the swap kit does not work on the later year spool K frame mounts.
I have used the kit your looking at 4 different times now. Allways a good result except the /6 - B block swap. Which may have been my fault. Which I'll figure it out later. To busy with other stuff right now.