Spark plug wires coming off distributor while driving

[zuburg]

I have a 292 Y-block in a 1956 Tbird. On multiple occasions, I found that 2 plug wires had come off the distributor after returning from a 30 min drive. Has anyone experienced this? The last time, I used needle nose pliers to try to stretch the connector in order to get a tighter fit in the distributor. It didn’t seem to work as 2 more have popped off.