Funny you should mention it. The 6.0 LS Vortec has a very well know oil pump problem and I recommend everybody who has one replace it with the newer model. The pressure plunger has burs, siezes in its bore and fails to open starving the engine. Ask me how I know. Just finished dropping a L96 long block into my 3500hd. I have come to terms with the the platforms weakness. Noisy, piston slap. But can't say I'm more excited to pick up my 7.3 F450 in Montana next week.
Very excited to see these Earthcruiser quad cabs but I couldn't imagine a worse choice of engine platform. Spending that much modding, why not go with the new Ford 7.3 gas or at least one of the upgraded LS engines?