A lot of questions relegated to one post. Might be better to start new topic for each question. But, to answer in a nutshell, try the AACA forum (sub-forum Buick Club of America) to get opinions re: local mechanics....a few guys on there are from TX. As for tires, its totally up to your preference on what you're comfortable with performance/cost wise. I personally went with stock from the factory for a '91 Reatta...Good Year Eagle GT P215/60R 16" All Season blackwall.