Crank end play, destroyed converter, 408 nightmare

If the converter isn't seated and the trans to engine bolts are pulled up most likely the pump and/or pump gears will be destroyed. You generally don't get a second chance at this
Yes. That has been established. My question. Is there a way to check with transmission already in place? His motor is not yet ready to fire. I said he needs to pull trans out and re-install. But if there is a way to check without removing??