I'm going to try and document my engine build paying attention to everything I can. This will be a 2382, 98 X 78.6.
I started a while ago with case selection. Supposedly 1.7l cases are better EA I guess but I have 2 GA cases. One I sent to get machined and the other I had done locally. Choosing between the 2 I looked at the case split between the main bearings. movement of the case halves will cause a dull gray look and loss of machining marks. This case shows it was moving.
Click to view attachmentI would have preferred it look more like this but, those are hard to find around the center main. It is brighter silver colored and you can see machine marks still.
Click to view attachmentAs a quick test you can use a not too worn old bearing to see if the the journal are enlarged. If it slips in and out easily align bore for sure. If it is tight keep checking.
Click to view attachmentBolt it together and see if you can catch the parting line with a finger nail. If you can you should probably align bore.
Click to view attachmentFinally, if all of that looks pretty good you can measure the bores with a bore gauge or have your machinist do it. This case had an oval shaped bore and had been moving so it got align bored and decked. I'm still hoping the other case is better.
Click to view attachment