440 Crank in a 383

Yes it’s true but what needs to be done to the crank is a little machine work starting on the counter weights in order to clear everything.
Once the counter weights clear the block, and the journals are addressed and etc…. it’ll drop in. The 440 cranks stroke is (IIRC) 3.75.

On a camshaft, there is no one specific camshaft for this.
That’s actually ridiculous.
Choosing a camshaft for what you are planning for the engine and car’s performance is a starting point.

The harder thing about this is, if I’m correct, is pistons.

@fishmens67 is a fella here that can guide you well in this endeavor.