The Service Parts List provides the following:

Up to car #556
Cable 1: 27-1/2"
Cable 2: 26-1/2"
Cable 3: 26-1/2"
Cable 4: 25-1/2"
Coil to Distributor: 17"

Commencing car #556 when flat 4 cable clamp was introduced
Cable 1: 28"
Cable 2: 28-1/2"
Cable 3: 32"
Cable 4: 33"
Coil to Distributor: 17"