LSM was one company I think a couple guys did them. There were a couple firing orders too if I recall correctly.

My cam was a double swap but, I think there were some that just swapped 7&4. It is easy to look at a cam and figure it out.

Just take a marker and mark the intake lobes. You can use a different color for the right and left banks to disrupt confusion. Then simply roll it across a flat surface counting off the firing order. There are only three possibilities.

18436572
18736542
18726543

After counting three intake events you should know which cam you have.

Leon