Mileage estimates??

I did a search and came up with nothing, but I know someone on here has to have a CJ5 with a 350 sbc in it right?? I'm considering doing a 350 swap in my jeep, and be running a T-14 (I know, kinda weak but I'm gonna try it), Dana 20, 4.27 gearing and 34" swampers. I'm wondering if anyone has any estimates on what I'd be getting for gas mileage. My plan is a stock 350 with fenderwell headers and a 470 Holley truck avenger 4bbl. I know the old chevy adage is 13 mpg with a 350... but that's generally in a 4700lb truck with a th400, not a 2800lb jeep with a stick. If anyone's got any experience with a sbc in a jeep please let me know what you're getting/got for gas mileage!!