If you don't have one, get yourself a copy of the Moyer Manual. Covers all the neat stuff like numbering & orientation of the pistons, rods & caps, etc. As I recall, 'front' of an engine is defined by the location of the timing gears.
Rings can easily be checked for fit by removing them from the pistons and putting them into the bore. Use a piston (upside down) to push them to the bottom of the bore. Then measure the end gap of the ring. A good ring will have an end gap of less than .010". I did one engine where the old lower rings had a gap of over .100" - they were just along for the ride! PO did mention that the engine was smoking a bit..
Yes, the upper rings are the same.
Checking piston clearance is a bit trickier. Don't know your 'shop' capabilities. I think I satisfied myself that piston fit was OK using feeler gauges, but don't recall the details.
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