I typically don't post here much, but had to share my '75 T&C. The hubcaps are actually finned Vette caps (2nd pic). I think they look good... Last interior shot was prior to new carpeting too.
It's the little victories that keep us going. None of the windows on my wagon wanted to move at first. Only 13 years of sitting. Now, although a couple are slow moving, they all work!
Look at the ground strap first. Make sure the sending unit is getting a good ground. Then test the ohms on the sending unit. S/b between 10 and 70 ohms. I know grounding the sending unit wire will send the fuel gauge to full, so it's possible your sending unit wire is grounded out somewhere.
I've yet to install it. I'm sure it didn't need the 750 cfm, but I ran the 1407 (same carb minus the electric choke) on a 302 and a 460 Ford, so they're adaptable to about any engine. Plus I got a great deal on it from eBay...