Hey Im pretty sure that I need a new pump after putting in my 350. Off idle stumble and backfire Unless fuel pressure regulator is cranked. It drops of to around 8psi under first hard accel. I was just wondering if anyone had any Part numbers that I can use so that I can get one of the higher pressure pumps. Sorry but its in a 90 pickup!! will the vortec pumps drop right in?? Any help is appreciated. Thanks