Good afternoon everyone
I have my 1970 Cuda, 383, 4 speed, 4:10 gear. Tires in the rear are 275/60/15.

The engine is bone stock 383 2bbl engine (now factory 4bbl intake, hp exhaust manifolds). I topped it off with a fresh rebuilt Holley 3310-1 780 cfm carb. The carb was tuned by my buddy who actually knows what to do.

The car start half a crank and usually runs good. Every once in awhile on take off the car starts bucking but clears out. The issue I'm having is sometimes it seems like it has bogs when the secondary open and horrible gas mileage. I recently took a 67 mile trip with a full tank and it's now at a quarter of a tank. I did the math and it's getting 5 mpg on side road drives just putting along.

I understand these cars are not built for gas mileage but dang.

Is the carb too much for this engine? Timing is 12 degrees advanced and spot on.