In a manner of speaking. There's a facebook group focused around this swap, there's been some progress there. Mostly focused around a flexplate with the magnum tone ring for use behind a 5.2/5.9.
LA-B/RB Engines to 8hp70-90-NAG1
There's also a guy on the ramcharger forums who's doing one, using an ATI mopar to GM flexplate. It requires a crank adapter and the adapter will require some machine work.
'86 Ramcharger
I designed a flexplate that I THINK will work. I used a SB bellhousing blueprint and measurements I took from my SB and my brothers Gen3 plus info from the Ramcharger guy. My 3d printer isn't quite big enough, so I can't make a test part.
Here's a link to the model, they're stored in .STEP files, so compatible with just about any CAD software out there. It's designed to be used with an ATP ring gear, P/N ZA-507.
You can make a cheap prototype using sendcutsend, if there are any changes needed, please post back so I can update the model.
Free for personal use, but not to for commercial or sales to others.
LA 8 Speed Flexplate - Google Drive
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