Fuel in engine oil

Hi this is Scott, I am trying to trouble shoot some problems on my Father and suns project 1972 360 Duster. I am trying to tackle a little at a time as this will be for my younger sun and he has 5 years till he could legally drive this car anyhow. The car is a 360, 727 83/4 391 gear Duster. When I first got it she had been sitting for 4 or 5 years and there was a strong smell go gas coming from the oil. I changed the Carb from the tired old holly to a new Edelbrock, then I changed the oil. Ok so I have not put any milage on the new 360 other than running it to worm it up in the garage for the last 6 months and today i pulled the dipstick and there it is again gas in the oil. I do not want to run the motor again till i know why this s going on, and how to fix it. I am sure a lot of you guys have forgotten more then I know but man this duster is making me learn. Thanks for any assistance.