In all seriousness Luke to help you out. But this is your first year of even attempting this sorta thing. As far as mods, i’d take care of all that stuff on your truck you said would break if someone else drove it. If the truck isn’t mechically running where you can push the hell outta it when your on course, then work on getting it there first. Second, once you feel its soild enough to take the abuse, take a EVO school next year. http://autocross.server269.com/evolution/modules/news/
No mods you will ever do to your truck will make up for a actual learning experience (aka. you need more seat time) when you are evaluated and compared to better drivers. There is probaly more time left in your truck than you know, trust me. If you need proof, go look at your class and PAX results North Hills Sports Car Club Autocross Results
When you can start running near the upper half on the PAX index THEN you can start to think about major mods. Again not flaming you, but if your serious about this then you have to do it the right way. Tossing a V8 in your truck will make the truck alot faster, but it doesn’t automaticly boost your driving skill level at the same time either.