#2 yes you have to measure the journals of the crank for the correct bearings.
One of the best things I bought was a good 6" caliper, I bought a decent one Starett it runs like $100 bucks but I use it all the time.
I have the tools for measuring, thanks.
#3 is going to cost money, most of the time you will have to re-balance the lower end.
OK, so even though a 360 is externally balanced you still have to balance the rotating assembly??
#5 I am not a fan of HV oil pumps unless it has a deeper sump pan.
It probably will have a deeper pan.