Narrow "Stock Location" Mount Fuel Tank for 1968 Dodge Dart?

Oval style exhaust is certainly something I could look into. The other thing I'm now debating about is if I want to move the axle back an inch for 29 inch tires instead of 28's. If I do that I'd just put a fuel cell in the spare tire well and then I wouldn't have any issues fitting the exhaust out the back. Decisions decisions...