I am not in the loop but here is my guess, 25-30.
Andretti
Bacon
Ballou
Boespflug
Chapple
Clauson
Courtney
Darland
Farney
Grant
Hines
Jarrett
Kobylarz
Leary
Robbins
Short
Simon
Stockon
Thomas Jr.
Windom

Cockrum?
Coons Jr.?
Cottle?
Schuerenberg?
Stanbrough?
Swanson?

Spridge would have a real close idea.

Nice to get some discussion back to non wing sprint cars!! If this list is close it will be a heck of a show!!