Dudes, I am trying to decide between two build options for my current project.
The car: '67 Barracuda Fastback
The Build: Nasty Big Block (440) Street Machine

I started building this 12 years ago. Back then, I cut out the spare tire well, because it was hacked up. My plan back then was to weld in a flat piece, and then install a fuel cell. In 2005, I was going to just run a carb.

Fast forward to 2017, there are easy fuel injection kits, and Spectra tanks with electric fuel pumps. So, I want to go fuel injection now.

Here are my two choices:
Choice#1
Weld in flat trunk floor
After market 16 gallon fuel cell
External EFI fuel pump

Choice#2
Get a new spare tire well and weld it in
Install Spectra Tank with internal EFI fuel pump

From a cost perspective (just counting fuel system - not EFI system) what would you do (given that my trunk floor is already cut out)?

This car is going to be my rough, blunt object - instead of my nice looking cruiser.