Grady - With all respect. I've been running a "dead head" system on my 70 T with Zeniths for 20 years. I tried the recirculating system, but it wouldn't register any pressure. Maybe I was missing something like a restricter in the return line ??
PS: are there any rotary pumps out there any more?? I've been using a Facet Low Pressure Cylindrical Fuel Pump from Pegasus Racing mounted on the front cross bar. Just found this Carter rotary pump and may give it a try.
Carter and Webers