You might get away with a set of rings and a light hone in situ.
To be honest with the questions over the engine you bought i would also check the piston / cylinder clearance. Is there any signs of wear in the bore ? It may be the original engine builder was a bit rough and opened up the rings too much.
Hope it all goes ok mate.
The engine is only held in by about 4 bolts at the minute and for the sake of undoing them I would rather take the engine out again so I can work on it in the warmth of the garage as winter approaches.. (also I dont want to leave a 90% stripped engine out in the elements.)
I will checking all the tolerances when its out to completely satisfy myself and also replace anything that needs doing.
With regards to the bores I have not yet got round to checking the piston clearance but it is on my list. But no there are no obvious marks on the bores or the pistons so fingers crossed..
One things for sure it will be getting a light hone and new set of correctly gapped rings as there was evidence of blowby on the compression rings..
It doesnt bother me too much as atleast now I am in complete control of the build and I have peace of mind.. It is starting to bother my wallet though lol