FB_MItch

So I just got around to dropping my rebuilt 12a into my 79 rx7. I have had it running and it's running rough especially at idle. But my biggest problem is that I'll run the car for 10-15 minutes to make 100% sure that it is up to operating temp (have since installed a temp gauge so I am positive it was up to operating temp on my most recent attempt) and when I shut it off it sounds like a toilet flushing almost, just running fluid, I took off the intake cover and air filter and found that the carb had filled itself up with fuel almost all the way to the top. I felt the return fuel line and it feels like it's not even pressurized, the feed line feels nice and stiff under pressure but the return feels soft and empty this leads me to believe that the car is literally depressurizing the fuel line by dumping all the fuel in the line into the carb. Me and my buddy both looked around and couldn't figure out what could cause this to happen. I know rotaries will flood if not warmed up but I've been able to replicate the situation multiple times now after turning off at full op temp. I don't want to run the car anymore until this gets sorted out as it's drinking fuel like crazy even when running and the dumping could wash the lubrication from the rotor housings and definitely don't want to damage my fresh rebuild. Any help any of you can give would be greatly appreciated!