Choosing the right stroke for a 340

Thanks for your inputs guys! I have a general question here. There are engine builders and machine shops, torque converter shops, cam designers, differential guys and fuel delivery specialists.

Who is the right type of professional who looks at the entire system from the weight of the car the size of the tires type of rear gear and determines the right stroke cam and converter and tune to get what a customer is seeking performance wise. I know we all have our opinions here about the individual components but at the end of the day this is a system.