I had one in my nova for a while do not know the how many miles were on but with a performer rpm intake an a set of headers with 3.31 gears it ran a best of 8.41 in the 1/8 mi. Then I rebuilt it with a 292 cam and 9.7 to 1 compression same intake 3000 stall and 4.10 gears the car ran 7.70 with mufflers and 7.44 with open headers. I ran this combo for several years and was dead reliable never touched it. I shifted a 5500 rpm I still have this motor as a spare.