Before you go and spend a shed load of cash on new shells get yourself some green plastigauge for £10 and measure the shells you have. Take some photos and post them here and do the same for the mains. The experts on here will be able to advise if the shells are scrap or useable (and assuming they are within tolerance after measuring with the plastigauge).
As has been said previously, please make sure you have made a note of where each individual half shall has come from and if it came from the top or bottom crankcase half. Post some photos of the journals as well.
One item not mentioned for your parts list is a tube of Hondabond. You will need this when assembling the crankcase halves. It's not cheap and don't be tempted to use instant gasket, you'll regret it when it blocks up the oilways and wrecks a newly rebuilt engine!
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Ive ordered some plastigauge green, should be here next week.
My nail doesnt catch on any of the crank case bearings but does slightly catch on the con rod bearings. I went to the engineering firm at lunch today, who fixed my tensioner for his opinion, he's been doing engine work for 40 years and has been recommended by a local restorer who uses him who has done work on previous cb400fs he was restoring. He said they dont seem too bad and would just replace them like for like. I'm going to wait until I can test it with the plastigauge before I pull the trigger on anything.
Upper crank case
Lower crank case
Con rod example
Another con rod