G'Day,
Not an Expert but I do know some Trucks (361CI from my experience) ran with D/D timing gears as well as a Governor mounted under the Dizzy.
They also had Sodium filled valves from memory.
Some of the Marine Applications ran in Reverse to balance the Thrust of the other Engine in Twin Engine Configurations.
(Otherwise the boat would have a Tendency to keep trying to go in Circles.)
I have a few sets of NOS Direct Drive Gears & have been tempted to try them.
I'm thinking 100% timing Accuracy, No Stretched Chains / Play Etc.
But you also need to run a Reverse Rotation Cam & some other Gear.
Not sure I'm Bright enough to work out the Details. LOL
The "Industrial" would be reflected mainly in Inlet / Outlet Manifolding & Perhaps Piston Compression ratios.
(Lowish Compression, Not designed for High Revs so much but rather Bulk Torque & Longevity)
I seem to remember that some of the Truck / Industrial Engines had Hardened Bores Etc to make them Heavier Duty.
The Advantages would lie in the Bore wall Thickness, If you have the right Block it will bore out to 440 + 60 perhaps even further If I'm correct.
I also vaguely remember there being something "Special" about the Cranks as well.
If you look at the back of the Block there should be a 1/2" thick circular Pad behind each of the back cylinders, where they would tap & plumb fittings
to run the water through the Block (For Marine Applications) rather than recirculate it as in a car.
All of this from an Old Man's Memory and I don't Trust it Myself.
So it would pay to do some Research.
Regards Tony.M