Whoa! Calm down Steely. Mellow out and get your sea legs back.
Sounds like you are havin fun. Congrats on the initial fire in the hole. Good thing that out-of-time cam didn't crunch any valves.
How did you determine that the cam was out-of-time? Did you remove the head cover so you could observe the timing marks on the right end of the camshaft?
Since you are only running it 30 seconds at a time, I wouldn't be too concerned about the exhaust smoke. If the smoke continues, I would be concerned. How much smoke are we talking about, like the wisp off a lit cigarette.....or......a mosquito fogger
Nothin like the thrill on the initial startup of a fresh engine. Are your hands steady yet?