Just stroking a 261 engine and using the same head on the "stroker" as the stock 261 engine will gain almost a half a point of compression by itself. So you will need to do some number crunching first and find out some absolutes as far as final combustion chamber size, bore size, block deck height, head gasket thickness, etc...so you can zero in on a target number for compression. Stroking an engine changes the compression, all else being the same, as does boring the block. So determine all these values you will have and this will help let you know what path to take.
I think you mean moly rings vs. standard. Either are fine, but if you want moly, just make sure they are available in the bore size you end up boring the block too, sometimes they may skip that size and only the standard cast ring is offered.
