86, Look at the Prod rules or maybe the local SPU, and see if that is a better fit. Many old IT cars go to Prod as the rules are much more open.
If you have a few cars built similar , run them all in one class and have a good time. If one cars kicks ass, just add in 100# and start over.

Some buds run in the DR with glass panels on DOT tires. I can get some rules for that also.
Feel free to E mail me or call anytime. MM