Ok , so I got a 340 sixpack in my 70 Challenger T/A. The accelerator pump blew out and I need to replace it! So as I try to get the carbs off I unfortunately kinked the center carb fuel line. the inlet fuel bowl nut turned and not the fuel line nut! I've tried every wrench in my box and cant get anything on it to hold it while I loosen the line nut! Does anyone know if there is a special wrench available to make thin job easier?

p.s. I will be ordering a new set of stainless lines for re installation