No luck.
I turned the motor over to what I thought was the compression stroke and installed the piston stop tool. I marked each rotation on the pulley wheel in line with the timing mark, put everything back together, and hooked up a timing light. Nothing. It's possible I turned the motor over too far or it might have been on the exhaust stroke instead. In that case, I would have just marked the wrong side of the wheel. Also, I managed to damage one or more of the plug wires and may have put one back on in the wrong place.
Another wasted day. I'll give it another shot tomorrow. That first spark plug is hard to reach... I had to use a foot-long socket extension to reach it. Otherwise, you're just going to end up cursing and dropping stuff.
I spent the rest of the day raking leaves.