Well, as Mark pointed out early on and I was too ignorant to understand. The 161 was equipped with either Autolite or Delco electronics, starter,generator, distributor and maybe voltage regulator. Although I am not sure the regulator was different. Depending on whether it was in a K-F car or a Willys and it sounds like even some differences by year, you will have all Delco or all Autolite. This also drives the flywheel ring gear tooth count and diameter. If you have an Autolite starter, the location of the starter is such that it will only mesh with the 124 tooth ring gear, a Delco starter will only mesh with 129 tooth ring gear. I think I got that the right way around.