Main Studs??

I have done many through the years and not even worried about it.

yep what he said! done it plenty no problem. the only time I had to have one line hone was one that the saddles in the block were off. you would set the crank in the block and it wouldn't turn without the caps being on it.
I didn't take that block apart before it went in fro machining but my guess is those bearings and crank didn't look so hot.