The 454 has tons of torque, but is short on the HP curve because the torque drops off quickly. I had a 93 4x4 with a 5.7. Had to eventually put in a new fuel pump and ignition module, otherwise it was fine until it lost reverse gear and I sold it to a mechanic. Keep in mind it has two air conditioners front and back. The ac lines run under the passenger side and are prone to rust. You can easily get front fenders if they rust. You can also get a rear fender patch where condensation from the tailpipe causes rust. Mine is probably out there someplace.
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