Howard's or Lunati
His approach begins with determining the ballpark specs that one should be looking at based on the combination, possibly zeroing in on an ideal set of specs, then seeing if an “off the shelf” cam exists, and if not then moving on to “custom”.
You either educate so as to have a general idea of specs you should be looking at, up to maybe even picking something as close to ideal yourself. Or have a company select one, but now likely understanding why they settled on the particular specs.
One can choose to not get educated, have faith and let someone pick, not really knowing the why. All depends on how into it one wants to get.
Do you like to read? Either search the web for articles related to David Vizard and camshaft selection (using his name and any combination of search words relating to picking a camshaft) and and/or seek out this book:
You either educate so as to have a general idea of specs you should be looking at, up to maybe even picking something as close to ideal yourself. Or have a company select one, but now likely understanding why they settled on the particular specs.
One can choose to not get educated, have faith and let someone pick, not really knowing the why. All depends on how into it one wants to get.