Eddie, good to hear you've hooked up with Mark. I understand there are a few other independents around, but I've been satisfied with Mark so I haven't pursued any others. Before getting acquainted with Mark, I did have some initial work done on the car at the Lambo dealer, and they were OK too. Both Mark & the Lambo dealer have Leonardo's, and I think those two are the only ones in town.
You're probably already aware of the C&C get togethers on the 1st Saturday every month over at Vintage Park (Louetta & 290)? Normally there are several hundred cars of all shapes/sizes/marques, along with several thousand tourists. Houston Coffee & Cars | Where All Automotive Enthusiasts Meet To Share The Same Passion. It starts around 8 or 8:30, but I learned the first time if you don't get there by 7 you won't be able to park with the other Ferraris - it fills up that quickly.
The local FOC or FCA crowd are fairly active too, and get together on the 1st Sundays, IIRC, for brunch, etc.