I read that Crane Cams and Comp Cams can custom grind you a small block chevy cam with alternate firing order (so all you have to do is change the order of the spark plug wires on the distibutor); the reason you may want this "marine" firing order is that some people say it has better "intake balance and/or exhaust header balance (...something about 2 adjacent cylinders firing in sequence messes up tuned header design)", and "promotes better cooling".

So... thinking out loud, I'm wondering if it's possible to change the firing order in the LS1/LS6 PCM and get a alternate firing order cam ground...?
:?:

You could casually drop "...oh yeaarh, I changed my firing order..." in your converstions... he he he.