These days serious engine builders work everything out on paper before they ever order a part. then they use a scientific rigor to evaluate the results. today we also use computer controlled injection systems and computer controlled ignition systems to get as close as we can to perfect for that build. Setting up design parameters is critical to the success of the build. One of the parameters is picking the design fuel for use in the engine as an example for a street engine we use pump gas as the design fuel and work around that parameter. Power band is another so where do we want the power band to be. Is this a Tow motor or sports motor just what is the intended use of the vehicle..Once we know all of this then we build a motor to suit the intended purpose..No longer do we just throw parts at the build.
Now if you do go to an experienced engine builder most likely he has various builds saved in his data base and can most likely have a parts list for that build. For the guys stepping over the edge the we accept that sacrifices to the gods of speed will be made and we will bust some parts on the dyno or race track at times and this is the price of progress..
I have tried most all of it and now do what is known to work..