I thought we could attempt to compile a list of dirt champ cars that ran USAC between 1956 and 1969 that still exist today. Same deal. I'll start!

Willard Battery #98-restored
Leader Card #4-restored
HOW Special #21-restored
Sterling Plumbing #56-restored
Central Excavating #81-restored
Vita-Fresh #7-restored
Central Excavating Kuzma-not restored
Bowes Seal Fast #1-restored
Sheraton-Thompson #1-restored
Lindsey Hopkins #1-restored

Take it away!
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Your list could be very difficult
Dean Van Lines 1=driven by Jimmy Bryan in 56 and 57, restored to the 9 livery it wore in 1954
Dean/STP Kuzma-driven by Sachs and Andretti=believe restored and sits in Knoxville HOF
VPJ Grant King 3-ran 1969 with A Unser, appeared 1970 as JL 2. Unsure if this car has been restored as the JL 2 or as the Viceroy 1. Both cars now exist and unsure of the history
King O Lawn 12-restored
Leader Card 2=restored
Bell Truck Lines 17-restored
Joe Hunt 99-restored
Basement Bessie-restored
Agajanian 1952 Indy winner ran up through 65 and is restored

A photo of the Bowes Seal Fast #9, currently owned by Ray Evernham, I believe, is in the AC Wolf Restored Race Cars album attached to my profile.

I restored the Federal Engineering Champ car No. 15 (Meskowski chassis). It ran from 1964 to 1974. Ran Champ car series with Bud Tinglestad and Jun Larson driving it. It was transferred to the USAC Dirt Division in the late 60's and then later ran 1973 and 74 in the Silver Crown series. It still had the 255 OFFY in it when I bought it from the Moore Bros. I ran it for about 5 years in many road racing events (with a 4 speed) and some circle track. I sold it to Bob Boyce around 2002 and he sold it on to someone down here in Florida. Nice car, I wish that I had it back.