5.9L, Melling HV pump, stock pan, dual remote oil filters

The best thing you can do is start with top quality machining. No taper and proper clearances goes a long way to keeping the lower end solid. I've street raced, drag raced, and highway raced over miles and miles with stock pans with no baffles. I always run a windage tray. I don't use HV pumps on engines with good clearances but I do use HP pumps - a standard pump with a higher pressure relief. If it was me - I'd make sure the valley is deburred and I drill and smooth a few new holes where oil can pool. Run a windage tray so the oil that does go down gets to the sump and the oil in the sump isn't picked up and caught by the crank. 6K is not really high rpm, and drag racing is not "sustained" rpm.
I've installed the accumulators. When it's all said and done you're goign to spend upwards of $600-700. They are nice but IMO not needed unless you're road racing. Properly tuned, properly maintained, and properly warmed up a drag race engine will last a very long time without one. They have for decades.