4.3 firing order - this sequence looks wrong

[ShoalSurvivor]

BEFORE removing any wires, I traced them all, and this is what I found:

The numbers correspond to the FWD numbers on the distributor cap.
I would expect some symmetry, and this just seems off.

I replaced the plugs recently, and marked them, and this is also the only way the existing wires reach all the plugs.

Is this POSSIBLE?
I couldn't find a definitive diagram - is there one?
or do I need to pull the plugs to find the TDC, etc.?

222 HP Factory Remanufactured 4.3L
Specs: 225 HP @ 4800 RPM ‑ Standard / Left‑Hand Rotation ‑ Remaunfactured 4.3L Partially Dressed Marine Engine Assembly. Features Include: New 600 cfm 4bbl Carburetor, Electric Fuel Pump, Nodular Iron Crankshaft, Roller Camshaft, Vortec Cast Iron Cylinder Heads, Stainless Steel Valves, 9.4:1 Hypereutectic Pistons, Full Roller Rocker Arms and Thunderbolt V Ignition.

 

[ShoalSurvivor]

Upon further inspection, it IS possible that I switched the #2/#4 wires (there is sufficient length to reach either way), which would make the correct sequence:


Is this more likely?

 

[Fun Times]

To start, the numbering system in the first photo is off… 4 & 2 are swapped incorrectly… 2 is up front 4 in the middle.

262 cid / 4.3L Gen + Marine Engine Specifications | PerfProTech.com

Large selection of quality mercruiser parts, marine engines, marine parts, boats parts and accessories, such as Mercuiser engines, exhaust, motors, and other boating supplies and accessories. Find affordable parts for leading brands including Volvo marine parts, Mercury marine parts, Quicksilver...

www.perfprotech.com