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Re: 4L80E (and 383 stroker) project
Thank you for your research in finding these parts, and sharing the results with us here.
I don't know for certain, but my guess is that ring is a reinforcement that goes between the flexplate and the bolts. As long as the center of the flexplate fits your 383 crank snuggly, and if the dowel pin in your 383's crank will fit one of the 3 holes in the flexplate, you should be fine.
You might start a thread over in the '73-'87 section to see if anyone over there is familar with the 292's backed with the TH400.
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