Weird 904 to 408 magnum starter interference issue. Dakota starter won't fit? 64 push button trans. is that the problem?

Yeah, it's a real shame the customer didn't call us sooner. unfortunately the shop really took advantage of him. Sounds like it's common, and if it were sitting right in front of most of us, anyone else would have added some clearance to the block, and maybe a little to the starter, and "starter #1" would have been bolted on, and he'd been on his way. Appreciate the feedback.
Maybe the shop should be called outside one FABO members should avoid using?