Too Much Carburator?

Recently Bought A Killer 70 Dart 340 Swinger From A Local Mecum Auction (what Fun) And This Thing Is A Lil Beast. My Question Is I've Had 2 Episodes When On The Hiway It Seems To Burped Gas Or Possibly Oil On The Exaust Leaving A Heck Of A Smoke Trail Until It Burns Off. No Notice Of A Drop In Oil Press Or Anything. Just A Splash Of Gas Maybe Oil. The Motor Is Preety Radical W/ Cam, High Rise, And 750 Holly, Headers. At The Chrysler Classic Weekend Some Guy Said The 340 Couldn't Possibly Use All The Gas Running Thru The Carb, But Its Not New, And Is A Well Built Car. Any Thoughts?