Spark at the points when opened manually.
Spark out of the coil when points opened manually or when engine cranked?
Obvious answer is a cap/rotor problem. Shorted rotor, cracked cap, missing center contact.
Wrong cap/rotor combination.
Second possibility - if spark at the coil when points are opened manually but not when cranking - wiring is wrong/bad. Power to the ignition is shut off during cranking.
obscure possibility - distributor shaft not turning
