Well I found out the cause of the weak compression on the passenger side, and so the plot thickens...
So on a whim, after I set the crank and rotor today, I decided to pop the valve covers before I buttoned things up. The drivers side looks fine, but it looks like 3 pushrods on the passenger side pushed through their rockers. I attached a pic below... Can anyone ID these rockers by looking at them? I guess I'm going to need to replace the pushrods too. If I unscrew the rocker arm, will the valve fall into the cylinder? What's the procedure for this?
Thanks everyone for your help so far!