that would be fun right there pulling wouldent be the problem its controling the load that would cause a problem but a flat out pull up hill i could take a stock 7.3 psd ive done it time and time again but its still a grape compared to a grapefruit just on the same stretch of road if you look at the # the motor are very close in power ratings the ford has a lot more wait longer wheel base the 392 was used in dump trucks and buses hauling maxed out at red line day in and day out there is a 7.3 in the yard in a f450 a 2000 something with a cracked block because it couldent handle 6000lb load day in day out at or close to redline not to mention the frame bent 2 beds fell apart all crushing the wires and truck is scrap trannys shot motor shot bed is crushed from the wait springs are bent shocks are blown cab is alittle beat up and bent but still good the international water truck 392 20 years in service truck was still running and driving was sold because used to much gas and was ugly and just beat had 8 years in service as a water truck with 750 gallon tank 392 20 years of service as a water truck 2000 gallon tank all driven the same by the same people the only limits i see on the 392 are in the package u stick it in 390 ford and 382 dodge gas motor are not even in the same class there car / light truck motors my opinion is based on driving a few trucks with the 7.3 psd and going riding every weekend with my buddy with his 7.3 psd on the same roads and the scout with more of a load "not counting the 2500lb the ford has on my little scout with out a load "the scout out performs the ford in the sierras step and tight roads not on flat ground if i could talk my friend in to hauling my truck and my bikes with his truck and belive me ive tried we would do it every weekend the ford will pull it with out batting a eye and get close to 20 mpg doing it cant say that about any gas motor http://images.ford-trucks.com/forums...2/sign0101.gif
The PSD's are great trucks and are without question a vast improvement over the old FE F100/F150/250 etc., but I tell you, when I pull into a campground with my F100 towing my travel trailer, I will have a group of guys around my truck before I have the safety chains off. An old F100 in the midst of all those big $$$ diesels will draw more attention than anything in the park.
I don't know about the 383, other than it was a good old power wagon engine. But between the 390 and 392, International takes the cake for low end power, no comparison. Shear size of the block, crank, heads, and everything else on IH's V8s shows that they weren't concerned about making a light weight engine.