I wouldn't go with a first gen for towing heavy. Unless you want to box the rear half of the frame, and replace a large portion of the factory wiring. Some pump tweaks will also be in order, but unless you get crazy with an aftermarket fuel pin, custom pump head, etc, tuning the ve44 nearly always results in better fuel mileage.
A custom radiator would also be a worthy upgrade. There's a cross-flow, dual-pass one available that is quite pricey but will dump as much heat as these ones could ever hope to make.
Parts availability is tight too. Be ready to get creative making some Frod and Chebby parts fit.
A factory service manual is a good investment. You can get them on CD/ DVD from Geno's Garage for not too bad a price.
Second-gen trucks tow ok, with a manual. But the nv4500 five speed has a known fifth gear issue and it's best not to tow in fifth. Dropping speed to 65 and running fourth gear even from 70 will likely net better fuel mileage. A governor spring kit is a worthwhile upgrade, and will allow that with the 12 valve.
The nv5600 six speed is getting near on impossible to find parts for. If you can find a heavier Ford medium-duty with a Cummins and 6 speed in a boneyard, swapping the zf6 over is pretty easy.
Beware shiny black replacement vp44 pumps for the 24 valve. They are rebuilt somewhere in the Balkans and not tested, parts are measured and ones not in spec are replaced. If the electronics aren't also replaced, you're peeing in the wind.
6.7s like their fuel. The boss did full deletes on one looking for better fuel mileage. He says at least it feels like it has the power to go with the fuel economy now.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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