Timed my roadster - now runs worse

[rivcokid]

I was told that timing the car would take care of several issues, and it was a good idea to do it periodically anyway. So, armed with my Nu-rex, I followed the instructions step by step, finding TDC etc. Put everything back, and it was harder to start. When I got it started and took it out, it was like I was towing a Mack truck behind it. Little power in all gears, and it really lumbered up even the shallowest of hills. Playing with the timing lever seemed to do no good, or at least nothing appreciable.

So, of course, my question is - what did this novice do wrong, and what should I do to rectify it so I can drive it?

Thanks, always, in advance . . . . .