If you're sure the carb is working, I would check 1) the fuel pump, and 2) the fuel filter. After that, I'd look at spark. What do the plugs look like? Are the spark plug wires correct? Any breaks? Coil wire? Distributor? etc... work backwards, it's more difficult to skip over something. Finally, if it's running, but uneven, I'd check timing, and make sure that's dead on. Your situation almost sounds like a couple of problems, so chasing your tail is going to get you nowhere. One fix at a time! Also, I agree with Moper, if the intake seals correctly, oil doesn't get in there. Could there be a cracked seating surface somewhere?