I think getting your crank welded is extremely important, and getting a TZ bearing isn't a bad idea, and a big hell yea to the water pump impeller. I would also do the shift star mod and i like to grind out the shift shaft were the stud sicks through it were the spring is so you don't break that stud off when you are slamming gears you just take some of the metal of and widen that window out a little. And i would replace the spark plug boots, the resistors go bad alot in the stock ones.