Just installed Cliffs new design accel pumps on both of my 1910 Edelbrock Q-Jet equipped 455 Olds engines . I'm very pleased with the results. The pump on my 87 Olds kept coming apart, hopefully the new rubber will hold up better to the crappy gas that we have to deal with now. The 69 Olds hasn't ever had throttle response like it does now, it a day and night difference. Looking forward to getting both cars to the track, hopefully the 60 ft times will improve.