Are you sure that the corvette suspension is up to the job of supporting that heavy truck? (I'm not)

Realize that your truck is heavy, and big, so it pushes a lot of air. With a 235 I would not expect it to go over 55-65 for long trips even if you do find the gears to get there.

If you can be happy with 45-50 mph then I think it will do what you want.

You may find some helpfull or interesting ideas for axles and suspensions on my picture link below.

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-