Very cool, subscribed to your channel!
Dodge oil pans were/are less capacity, this is so it fits in the truck, glad you got a non Chrysler one. Also, did you build the engine and did what it came out of have an auto trans? The reason for asking is that with an auto trans behind it and using an oil to water cooler on it, like in a lower radiator hose, there is a plug installed in the block that shunts coolant flow through the lower hose when the stat is closed, this is to make it so the cooler has a positive flow around it when the stat is closed. If it is there, you can have a very slow warm up condition. It is located in one of the ports below the stat, behind the alternator bkt. in the block.
Your fan is gonna turn very fast!