yup i'm with brewski on this one
odd ALL of the cylinders lost compression though.
I would defiantly pull valve covers and check those valves.
If you have a scope maybe pull the plugs and see if you can get a view of the valves through the sparkplug hole that way and see if any are bent.

When you did the crank job did you pull the engine and flip the engine over, pull the pan, pull the crank without disturbing any pistons right? Or did you do it on a lift or on stands and go from the underside and do it that way? In either case i'm just curious if you might of moved the pistons too much and might of damaged rings or valves from them moving too far.