At a quick glance it looks like miss matched late cimas (1.5-2-4 rings) with either early ones on the other side or NPR's (2-2-4). Cast crank, stock rods, stock rockers (could be brazilian 1.25) swivel feet. Lightend 8 dowel flywheel.
Basic 2180cc, you need to get a new set of P&c's at the least. I'm sure it's way out of balance with those mish mash of pistons.
Pull the oil pump and take a pic of the cam, there should be a number stamped into it (if it's from one of the big cam builders) If Shadbolt did it then you will have to take it to him or colt cams to find out what it is.
The rebuild should be straight forward for the most part, get a new 26-30mm HD pump, main, rod , cam bearings and a good German Elring gasket set. Re use the cam if it's good otherwise choose a cam that will work well for your driving conditions and install new lifters.
What kind of engine do you want? Daily driver? Mild street strip? or?