Congrats on the tow rig! Other than the gas milage issue, you'll be pretty happy with the 454. I've got over 160,000 on mine, still running strong.
Try a wrecking yard for a manifold. There were lots of these trucks made, so it shouldn't be too hard to find. If you opt for headers, I would go with Doug Thorleys, or maybe the HPC coated Hedmans.
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Mike
Tin Benders
Ventura County Axle Snappers
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