383 cam choice

To your initial questions, yes, you could get significant improvement from a cam change.

Your cam doesn't open the valves, has a widish LSA (110) and has far too little duration, especially on the intake. It is a Chevy/GM cam. There is no reason to run a split duration cam with stock heads on a Mopar. You can literally see the backside of the valve just inside the port. It won't hurt anything, just not needed.

You want a cam that has 220-230 degrees of duration at .050, over .500 lift and the tightest LSA you can find. 106 or less ideally.

The second glaring issue is those gears. 3.23's aren't going to cut it in any way shape or form. IF you don't have an OD, you'll need some happy medium, which will be a 3.73 or 3.90 depending on your gear ratio