No crazy stuff required. It is not bad, but look at a 340, that was made to run past 6,000 rpm. High pressure oil pump spring and a windage tray from the factory. If you take those heads to full potential, you're looking at 500 hp. Not sure where that takes the rpm to on a 318 cu in motor, but it's way above 5,000 rpm.
Naw.. i'm shooting for a whole 400ish for this year.. i don't plan on going higher til i do a stroker at which point i am going to do the oil stuffs... i'm just using a melling high volume (i have always used HV and never had issues.. so i still do)