My midwest vintage racing club (VSCDA) recently updated our last year of eligible cars from 1972 to 1989. This means I can race a 1st gen RX7 that I always wanted to own back in the 80s. The last year are cars can be prepped to is the 1989 SCCA GCR. Before I rush out an get an RX7, I need to have a feel for what was allowable car prep in the late 80s. Can anyone describe in general (or specific) terms how the rules differed then vs now? New safety stuff is not an issue, as my club already mandates fuel cells, fire systems, seat back braces, catch tanks, etc. I am more looking for what "go fast" mods currently allowed were not allowed back then.

I wasn't sure if this question was better suited for this forum or for the General Discussion forum. Thanks for your help.

Marc in Indy