Compared to today's engines the 360 is all Heavy duty, but to try and answer your question as best I can, the 360 fe engine was intended for use in farm equipment and such. I guess you can say it was designed as close to a diesel engine as a gas motor can be,
This means it was designed to build torque rather than horse power.
Difference being that it can produce more working power at lower RPM than that an all HP motor.
For instance.
A subaru prezia with a 4 cylinder 1.8 liter engine can make 250 hp. at 4500 rpm.. but can it pull a plow across a field? No.
A ford 360 can make 250 hp @ 1200 rpm , and yes it can pull a plow in low gear all day long.
Having owned a dozen or more 67-72 ford trucks over the years I'll say this.
If you wanna pull a plow, use the 360 and run it long and hard.
If you wanna go fast, go to the salvage yard and buy a stock 390 with a 4 bbl carb.
The 390 is a nice trade off between torque,and hp. and they sound great with duals and glass packs.
If you want to go fast AND pull a plow? Go to the wrecking yard and pick up a nice used 460 and a c-6 trans.
You have to accept that you are going to get 10 mpg and move on, but a 460 has the high end horsepower that can launch you from a stoplight at lightspeed. and the bottom end pulling power of a diesel.
with most 3/4 ton/ camper special packages you get 4/11 or 4/56 final drive ratios and you will top out on the highway at70/ 80 mph or so, but from a standing stop this thing is so powerful it doesn't move your truck, it actually turns the earth in the direction you are going.
The good news about that 10 mpg is that it doesn't care if it's overloaded or empty it doesn't affect the overall mpg.
I once hauled 2.5 tons of coal in my 3/4 ton '68 ford with a 460 and that 2.5 tons of coal didn't change my mpg one bit.
best of luck.
Hope I helped