Body builders get big because they eat a lot. Just make sure what you eat follows a Paleo template (like yams instead of oatmeal or meat protein instead of whey). When you look at a typical BBr's meal plan, just think outside the box a little.
there are many guys (and gals!) on paleohacks who lift big and eat big. just use the search tab :)
100g butter = 700 cals.
Eat 200g butter a day would give you = 1400 cals.
Fill the other 1600 cals with good paleo food, make sure your butter is grass fed as can be "Kerry Gold" for example.
I personally love the taste of salted butter and eat 25g as a serving regurarly, it will raise your cals with good saturated fat which promotes testosterone and nutrients from the grass fed.
If wanted you can deink a glass of milk with your post workout protein shake/meal, the lactose and carbs in the milk will insure that protein is quickly shuttled into your muscles and used up quickly due to being post workout the carbs would be used quickly! As a plus you refuel your glycogen for the next workout!
What are you attempting to do at the moment? You said you're bodybuilder, but did not specify what phase you're in, when your next competition is, what your current stats are like, etc. Please elaborate.
Time until show?
Current training routine?
Is the issue just that you're having trouble eating 3,000 calories worth of food?