went to install new flex plate to 250 straight six and the holes are stripped can I run blots with nuts?
In somewhat similar situations, I have either used HeliCoils or drilled and tapped next oversize. But if you have room to get nuts on there. I guess it will work.
Probably not. There will be clearance issues either with the block, oil pan, or torque converter. Just get another crank & bearings, with rebuild if needed or get another engine. Loc-***e the new flex plate bolts when you reinstall. If you can drill & tap that is an option but the holes may need to be welded first & redrilled.