M119 engine: Check for spark for each cylinder on both banks. Best to remove the plugs I think. If there are 4 cylinders without spark.... yes then you need to find the reason: coil or distributor.
There are 2 distributors, one at each cylinder bank bolted to the cam shaft ends- quite clever.
2 coils also... Each distributor provides spark for 4 cylinders according the firing order (each distributor provides spark for 4 cylinders but not for the bank but both sides.

Martin