Ford 300 Inline 6
did F250's come with a 300CID I-6 ?
link above shows some torque & HP RPM's
engine built for 31 years a mighty fine power plant
is that unit FI electronic or carburated ?
i have a FI in a bronco gets its torque of 265 FTLB at 2K rpm
unless you identify an industrial power cam not a speed cam i would stick with stock and work that engine between 2000-3000 RPM
i wish mine was set up like in this article
Popular Science - Google Books
a 6 or 3 cyl dual displacement engine in 1977.. hummm.