looks like the one I have with my holley blue pump knockoff.

I am feeding it with a 1/2" line with 2-3/8 lines,one to carb,one for return.

this reg is not intended for a return line so I added a restrictor in the return line,i have 2 gauges and they both hold a steady 5 psi with pump on.

the stock intank pump is a high psi pump and may need to have a working return line like stock.

may just need the right reg