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Speaking of FE's and sleeper engines, there should be a good supply of 360's lying about. The later ones were underpowered from smog regs, but if built to say 1970 specs and tuned to 1966 specs, make for a fine torquey truck engine.First off.....there is no 400M.
In 1971 Ford built the 400 as a tall block Cleveland engine. Then, they destroked it to create the 351M.
Same block, but two different displacements. Saving money was the goal here.....while also replacing the FE engine.
The 400 has the longest stroke of any Ford engine ever built, and is capable of making stupid amounts of torque at low rpm.
Speaking of torque, the 472 and 500 Cadillac engines made gobs of it and really made an excellent light truck engine. A buddy had several conversions over the years, and they performed pulling and hauling very well.