As the engine is out, its a great opportunity to split the cases and pop in some new crank seals. The seals are not expensive. It would be a shame if you got the whole bike back together and then found you had a tired crank seal when you started putting a few miles on it. Whilst split, you could vapour blast all the parts. The guy I use offers really good rates. PM me if you would like the contact details.
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Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30