Hope you get it sorted mate!
As said, you NEED to remove the engine and unfortunately rip it to bits. I'm currently 80% rebuilding my engine. If you need any advice ask.
Before installing the crank finally you should of checked your clearances with plastigauge to ensure you are within tolerance else you will run into issues. You also need to consider ring gaps, end float etc etc! There's alot to get right!
I'd suggest you buy a workshop manual also as it gives you all the relevant torque settings / clearance's etc.
I did weeks of research before i tackled mine.
Good luck!