I just finished up a very similar build. Don't get me wrong, I'm happy with my car, it runs good (made 363rwhp/353rwtq) but I wish I would've built a 351w base to start with. I built a 331 stock block car (11:1cr) w/ AFR 195 58cc heads, and a holley systemax top end kit.
My car has an SCT chip that was tuned on the dyno, fairly straight forward and it's been done thousands of times. If you have a guy that's experienced in tuning the stock A9L it'll be a cakewalk for him.
https://youtu.be/tfvbFjNWcyw
https://youtu.be/ORCs2qb0FAM