6 As purchased, our fastback came equipped with a 289 of some sort. The previous owner couldn’t provide us any information on it beyond that. We don’t care much anyways, as our new plan calls for 5.0L Coyote power from Ford Racing Performance Parts, but we’ll check it out once we pull it from the car. In the meantime, it runs great. A compression check showed us that the cylinders were packing some punch, and were fairly even all the way around, which is mostly what we were hoping for. Our highest cylinder offered 155 psi and our lowest came in at 147, with an average of 150.