Well.... Only thing I can say is I see you said NOS? Well anyway's, I wouldn't run that junk in a 383. If anything go with a supercharger/blower instead. Me myself I like naturally aspirated and if not then blown but that's about it. That nitrous stuff just costs too much money to keep the motor lasing and your motor wont last as long. That's my oppinion at least but I have never used nitrous, I just hear your motor wont last as long with it even if you have pistons and rods FOR nitrous.