spark and no spark

You cannot measure what you are calling impedance (DC resistance) on circuits that large. Your ohmeter is not accurate. You need to test "while cranking" and test for voltage drop at different points. The 8 something at the coil shows a serious problem

Don't worry about ignition for now, you need to fix the cranking voltage problem. You need to figure out "where you are losing" the voltage.

How stock is the wiring? Battery up front?

The 10.57 at battery cranking is OK.

Check at the battery clamp on the positive cable, as well as the "top" of the battery post. Should be nearly zero voltage different. This is cranking.

Next move your meter down (clip if necessary) and hook meter to starter "big stud." If all that is between is battery cable, and voltage drops, then the problem is "in the cable."

Measure the drop directly across the ground again, while cranking

Clip one meter probe to engine block. Stab other direct into top of battery NEG post. Crank engine. You can jump the starter relay. You should have no more than a couple or three tenths of one volt, the less the better.

You can check positive drop same way. Clip one meter probe to starter "big" stud. Stab other probe into top of battery, and crank, and read. Again, the less the better, you should have no more that .2--.3V drop.