340 no can start
I had to look it up. I know the 4-7 is 18736542.
The other swap I call the Cadillac firing order. That one I never remember.
It's 15436872.
In the 18436572 5 and 7 fire together. If you swap 4 and 7 then 4 and 2 fire next to each other. 4 and 2 normally run a bit cooler so firing those two together isn't that bad.
The big dogs swap 4-7-5-2 so no side by side cylinders fire one after the other.