Welcome. Tim builds good trannys. Go up and talk to him in person, hes a good guy, and he will stand behind his work. Ive been there a few nights when hes stayed to fix a transmissions that were broke, or messed up because of the owner of the truck not too long after the build. He always makes sure he does what he can. Hell, ive seem him stay late to help fix transmissions that other people have messed up trying to build. Hes a good guy, and im pretty sure theyre the only suncoast dealer in this area, so if you want a suncoast, you wont get better prices around here. Just know what you buy, i know some people around here (missouri) are throwing together kits, and selling it as a stage 4 for a really good price, but most likely its not suncoast or a Mike L kit.
Also, a torque converter is a must, but a shift kit alone wont do shit for you. Transgo kits alone have proven to be helpful for the 6 speed allisons (lbzs- lmms) but not the 5 speeds.