First Q I have is why you had to get an engine? Next is what you want to do with your ride? Then how much you going to spend? As far as "matching" parts, that's a big part of overall performance. Keep reading/searching. Look at what others are using. There is a thread somewhere that lists most pipes and where they make power. Also your ability to tune should guide where you're headed. Start simple and build from there. Advance timing, improve air flow, add pipes, good reeds. This could go on forever. Learn from others mistakes.