Above are some wise words. For 300HP or so, this type of build for a street car is right on the money. About the only thing I'd do is ask for "waffle lined" frictions, rather than smooth or radial lined frictions, or perhaps consider the high energy frictions used in the A500. Many builders I dealt with, would use the high energy A500 frictions for a commercial vehicle or someone who was towing a trailer. Again, your choice. Stay away from the TF-3 kit, it's not what you need for a street driven car, the TF-2 is more than enough for what you are looking for. If you have an issue with the installation of the kit, phone Transgo on their tech line. Some guys like the TF-3 for the street, but other than the "fun" of constantly shifting I can't see any advantage over it to the TF-2. Might be a good idea to find out if the techs at Transgo recommend the TF-3 for a daily driver.
If the front band in your transmission is a flex one, you may have problems getting the cast band, as the band reliners need your core. The company I worked for always insisted on those bands, core in first.
Have fun, and remember DO IT RIGHT "ONCE"