Crank Thrusting Foreward Issues

I've recently had to put 2 different transmissions in from underneath leaving the engine in the car , of which I never do as I have always pulled the motor with them. I can tell you with a ton of experience if the converter was not fully seated there is no way in hell you would be able to freely spin the converter to line up the bolt holes. The flex plate and converter would be jammed together and that's even if you could get the block and trans to fully mate together.