While I'm no expert on this subject, I suspect that the dumping of all the extra gas (too rich/too much choke) into the cylinders resulted in the a lot of carbon/unburned gas on the valves and plugs. The choke may have been still on by the time you got to work. It doesn't take long for this crap to accumulate. Anyway, I think you are fine now except you may have to adjust the choke again to maybe a little richer depending on how it runs on a cold start. Good luck!

 

My observations from reading this thread. First he didnt say what year, so we have to guess a carburated engine. I figured that out somewhere down in the thread. Second he didnt tell us initially that he had changed the cam. Again finding that out after reading the whole thread, I have come to the following conclusions. 1) The choke should close all the way when the engine is cold. The proceedure was outlined in the manual. The thing that is not adjusted correctly or is not working is the choke pull-off. This allows the choke to be applied correctly when the engine is cold. Adjusting the choke as he has it now is a crutch and solved one problem, but created another. That being it is balky when cold. 2) Changing the cam to a HP, lowers the vacuum and such things as power valves and advance curves, even the choke pull-offs are sensitive to that. The symptom would be a stumble on acceleration. Exactly what is occuring. So you need to change the vacuum advance to proper one for that cam, and make sure that the power valve is set up to match. Then you will have a screamer that you can also operate cold.