How to figure the angle to drill from an above ground carport to basement next to it?
use a water level to find matching level spots inside and outside of the basement

get a large jar of water

get some tubing 1/8" to 1/4" long enough to reach from the carport, through a window or door onto the basement floor and up the wall of the basement

fill the tubing with water, put one end in the jar of water (loop it through a large metal washer to keep it submerged)

plug the other end with your thumb and drag the the tube into the basement 

hold the tubing high against the wall and release your thumb

the water level in the tubing will settle to the same level as the water in the jar