I am working on a 1981 C10 pickup 350. I have spark, checked firing order, checked the float, needles, and seats in the carb. But it keeps flooding out and backfiring.

 

Take a wood or plastic handled screwdriver and pop it on the float bowl of the carb a few times. Sounds like the float is stuck

 

kevinkpk.....thank you for the suggestion. I checked the float, checked the needles, and seats in the carb and those are fine. The carb itself was replaced 1.5 years ago but I did pull it out and everything checked out good. I will check the compression tomorrow since that is the only thing I haven't tested out of all the obvious fixes for this issue.

 

check inside the spark plug wire connectors, dist cap and plugs.
Plugs could be bad or could have slipped time if the dist wasn't tight.

 

Still sounds like the float is too high, too much gas

 

I had an issue kinda like this a few months back on my 79 350.
some of my spark plugs went bad got fowled. It cuased the rest of the plugs to flood so I replaced them all and it started up. But then my fuel pump went bad and my ignition fuse needed a slightly higher amp fuse. Always started on the first turn.