It's lean.
That usually means it's lean. Check all vacuum lines and gaskets for leaks.
It's lean.
It's lean. Could be something plugged in the carb.
It's lean. You have to figure out why.
lack of lubrication
That usually means the engine is lean. Could be a vacuum leak.
a vacuum leak.
CHECK your tioming - might have jumped a tooth - check control module or coil might be the problem
Unburned fuel in the exhaust system causes the backfire from the exhaust pipe.
gettin to much gas to the carb
Yep.
The valve timing is offAnswersounds like a possible worn camshaft lobe. a fairly common problem on late 70's Chevy small blocks