I definitely admire you for taking on such an ambitious project with all of the careful thought, planning, and fabrication skills required. I'm sure all of it will definitely pay off for you. Thanks for the photos of the processes involved and Hats Off to You! 😀👍👍!!!View attachment 12255
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And so it begins, out with the 318 rear and in goes a 420 rear.
Template is from the 420 frame so some mods will have to be made.Looks like quite the project. Is the template for places you have to cut out?
Looks good to me, I'd run it.