So you have a rear axle that came with dual wheels on it?
You want to bolt single type wheels on it (with nearly no offset)?

Sounds good to me.
Does it give you the track width you need?

Bigger question is will you have a gear ratio and transmission combo that makes good use of the Diesel?

Here's a speed calculator
http://www.onlineconversion.com/bigger_tires.htm

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-