Autocross and a 904 transmission

I autocrossed from '89 to '21 with some years off due to grad school, work etc. Most of those with my '67 Barracuda.
I wouldn't spend time practicing the 1-2 shift, unless your entering th edrag race.
First run autocross run, put it 2 and forget about it.
Study everything you can about a understanding a cone course and driving them well.
Some things you can practice on the street.
A lot of things you can't. The car will move in ways it can't (and shouldn't) on the street.
Get a feel for the course, then pick one or two things to improve or try out.
If you mess up big, give it up, stop the car. You can't make up the time lost in a fishtail or a spin. But if you can get back on course without a flag thrown, then use the time to practice the remaining course.
https://www.forabodiesonly.com/mopar/threads/lets-see-your-a-body-autocrosser.491133/post-1973450808
https://www.forabodiesonly.com/mopa...-whats-your-experience.443120/post-1972665236