Sounds like a secondary timing chain might have broke on you. You said the car runs very rough and wants to stall out?
I think that's a better bet on a gen I V8 than the flexplate. It's a V8, so it's an automatic, so there's no flywheel.
Although I agree with your nomenclature, please be aware that Ford manuals often refer to a flexplate as a flywheel. They do serve the same purposes.
KS
Although I agree with your nomenclature, please be aware that Ford manuals often refer to a flexplate as a flywheel. They do serve the same purposes.
KS
FYI, Maybe Torque Converter?
Had to replace mine when I first got it.. 1200$