so my machine shop called me a couple days ago saying that they were getting ready to balance my '83 6.2 engine and it turned out that my flexplate needed replacing. so i brought them another flexplate to check out off of an '82 6.2 engine. i just got a call from them and they said that it's not a match. apparently the holes in the flexplate for the bolts which hold it to the torque converter are not the same pattern. i found this very wierd b/c as far as i knew, it was easy to mix and match trannies and motors in pretty much any situation without changing flexplates. am i mistaken? what do you make of this?? thanks!