Horrible MPG/Fuel odor troubleshoot

I was thinking hard that it is a carb issue. But dont know squat about this summit carb.
Never had an issue before. Car runs like a bat outta hell. But the smell of fuel will make you sick.
I did change from an M1 single plane to a Eddie Air Gap(previous owner used that as it came with the crate engine). It is a 5.9 Magnum crate engine with some mild mods. Could this be the trouble?

Pipes run all the way out the back.
Open 3.23 8.75.
4 speed standard.