350 Still Barely Idleing

OK, I thought I had no more problems. After I fixed the leak behind my carb my idle returned to normal. The next day I was going to the lake and I only had about an eighth of a tank of gas so I stopped at the store to get some gas, killed the engine, filled it up and left, about amile down the road at the first stop sign I noticed the engine was barely idleing (again).
I know I dont have any vacuum leaks in the hoses as I only have 3, one goes to the brakes, one goes to the distributor, and the other goes to the valve cover, and I bought brand new hoses and put them on and still no fix.
I also replaced the carb gasket, and I removed all of my spark plugs and they had burnt oil on the tips and threads.

What should I do next??????

Ok,,,"Possibly",,,Now that you have proper manifold vaccume,,,,you are probably adjusted to rich,from when it was insufficient vaccume,,,also make sure you aren't pulling engine oil up out of your crankcase breather hose.