In another thread, I'm selling all my 16" wheels to go to 18"
Soooo... I have many used Hoosier race tires, all R6.
Sizes are 275-40/16  and 255-50/16
Some have 90% tread and a couple of heat cycles, others are near the end, but these are all useable.  I'll donate the thin ones to a good cause, but we'll need to negotiate the newer ones!
You Camaro and Firebird drivers in Solo should look at these!

Edited to add complete set of Hoosier rains, 255/50-R16 with half tread. Still very sticky!

Some good deals to be had - I got lucky

Good luck with the rest Larry.