Stock 1989 318 w/ 48k Miles - Rebuild Recommendations

No offense to anybody but you get many different opinions/advice.
I would do the basic stuff as mentioned. I guarantee that if you doing even a basic resto on the whole car you will definitely spend by far more than you budgeted for. Get her going and after you have cherried the car then pull the motor and redo it.
my own and other magnums have shown cross hatch at 100k
100k is a walk in the park for a magnum. Get it drivable then redo the motor and the fine details.
I have more than once done the drivetrain before the car and had to wait years to finish the body. Been there done that. If your flush with $ that’s a different story.