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Looks like you have a good plan.

Years ago we found a formula for converting equipment hours into miles. It based on the computerized Dodge speedometers that gave both hours and miles traveled. It is (Highway Miles=Hours x 45) So 2000 hours x 45 comes out to 90,000 highway miles. 4BT's on average have a history of developing coolant head gasket leaks around 130,000 miles. Looks like you will some time left before that develops.

GM made their rear axles "beefy" due to the unavailability of not yet having the modern alloys we have today. The weak links of that rear axle were axles that break and in some cases pinion bearing and/or pinion bearing seals. You may want to keep an eye out for a newer replacement from at least the 1970's or newer that has the same width and possibly the same bolt pattern.

I believe you can tilt the engine from vertical for clearance as they did in the step van retrofits. You can also offset the engine from the center of the chassis. You just need to maintain the drive line requirements for angles and lubrication of the transmission.
 
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