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Like I told you several times, just use the 4l60e flywheel and get some good hardened bolts. Or Chris at Circle -d Has a nice SFI flywheel that will work also.
Attepted the stock 60e flexplate. 2 problems; the clearance is .190" (had to go find some hardened wahers to shim it to .122" and the the stock bolts bottom out in the shallow yank boss. It is bolted in tho :-)