The AACA has a "Historical Preservation of Original Feature s (HPOF) Class"
Read about it on page 52 of this judging manual: http://www.aaca.org/publications/manuals/judges/2009_Judges_Guidelines.pdf

My point is the club is based in PA, and they encourage folks to show and drive original vehicles as is without restoration. They should have some advice on getting a nice original truck registered in PA, if you need to give the office a call and see what they recommend.
They also have a forum where you may get some advice.

Good luck,
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
---All pictures---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-