hey Quenton what 350 out there is making 330 horse what year what specs?? and i dont want to pay a lot of money for racing gas (so what should i decided to go with what should i combo up and build for my firebird give me the break down)??????? are 421 SD's readily avaible as well as the internals can they be easily acquired?????? KEEP THEM COMING BOYS MORE OPINIONS NEEDED