Best way to torque crank bolt
I just use an impact wrench with locktite.
I will add a cautionary tale here.
I did exactly this on my 318. Unfortunately, I somehow managed to bottom out the crank bolt inside the crank. Not sure how, I used the same bolt, same washer, same damper, etc. At any rate, when the bolt bottomed it must have completely rolled the last thread, as the crank bolt will now come out 2 revolutions before it stops. And, it STOPS. Impact wrench, breaker bar, heating it with a torch to a nice cherry red, it doesn't move. So, I had to cut the head off the bolt to finish disassembling the engine. I have another crankshaft for this build, but should I ever need that one it'll have to be in the hands of a machine shop.
So, be careful using that impact wrench.