All depends on the intended use.
If you'd prefer to keep your truck a real truck you may find some ideas here.
http://www.stovebolt.com/techtips/bigbolts/p30swap/

If you don't mind turning the truck into more of a car Steve's ideas could work just the same as they do for the 1/2 tons. You'll just have a heavier frame and larger than necessary fenders...

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-