SBC under the hood are not really boring but are common and very identicle to the last one you just looked at. The ease of parts availibility has made made it #1 in choice. Very common belt drives are a pic you just seen is what happens.

New ideas on belt drives will change the norm . The newer 5.0 has alot of options but there not in a book . This is where you have to figure it all out as you go .