1956 dodge questions what do I have?

My son's car is a 1956 dodge (custom royal)?
We are trying to decipher what it was called. We have for a model name d63-3-4door.
The original owner said it had either a 331 or 354. But in 1976 the engine had head gasket problems. It sat 8 or 9 years when the motor was replaced. Now has a super red ram according to stickers on valve covers. It was originally purchased in Canada. From Neil Motors in Regina. Not sure if Canadian car had different motor options or not.
Body 802
Paint Code 3091...

1956 dodge questions what do I have?
Author: Restomoder