(lack Of) Altitude Sickness.

I just brought my 60 CJ 5 from Colorado at 9300 ft to Florida at 51 ft.
It took 3 hrs to get it started and off the trailer. It hasn’t started since. I changed the plugs and they were BLACK!! Other than change the plug, what should I do, jets, timing??

 

Full blown tuneup is called for. I would do it as a matter of course.

 

So far, I’ve done everything but points and condenser. That’s neat.

 

Next.

 

If you take a motor that runs well at sea level to high altitude it will run richer as there is less O2 up there.
On motorcycles we used to drop the needle down one notch.;
Seems like your situation is not that way as you are richer at sea level. Call one of the old carb specialists.

 

This.
Always get all basics to specification before indulging in speculation and guesswork, including most especially points, and timing

 

Or finger if on an iPad.

 

change of altitude
so a change of jets would be in order . but you got to pull top off carb to see what jet you are running now

 

Colorado sells a 85 octane gas, might want to dump some 91 or 93, depending on what they sell there, in the tank.