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In no particular order:
1. Air/fuel mixture too lean:
a. Restricted fuel supply
(1) Plugged fuel filter (if installed)
(2) Gas cap not venting
(3) Plugged fuel tank outlet
(4) Carb float set too low
(5) Carb passage(s) restricted or plugged
b. Vacuum leak:
(1) Between carb and inlet manifold
(2) Between inlet manifold and block
2. Ignition:
a. Coil:
(1) Weak
(2) Polarity reversed
b. Distributor body:
(1) Rotor-to-body gap unequal
(2) Body cracked
c. Points:
(1) Not gapped correctly
(2) Corroded
(3) Spring weak or broken
d. Failed or weak condenser
e. Spark plugs:
(1) Incorrectly gapped
(2) Cracked insulator
(3) Fouled
(4) Wrong type or heat range