We had someone run them locally on them last season and they were almost a second behind me on the original ZII and I would consider him a good driver.
For SCCA events they need to be 200tw now for Street class or Street Touring.
For local events I would really hope someone wouldn't protest you on those. Some clubs (Milwaukee, Iowa) have come out and said that under 200tw will be ok this year but this would be the last year for that. Next year they will have to be 200tw.
In my opinion, if you are going to autocross more then a couple times...get the better tires.