I don't think you will find a single source for everything. Every guy has his own way or does what he needs by using what's available.
Others will buy what they can and have the rest custom made and won't worry about the costs.
There are many piston manufacturers out there who will make exactly what you tell them. Others like Arias, Ross & Venolia (if they are still around) have the designs for all the combustion chambers and only need to know what rod length you will be using. Cunningham and Carillo will make rod you design it's only $$$$.
I've read 10 different ways to do a rear seal on this site and they all must have worked for some one.
Camshaft designs have changed along with springs, retainers and keepers. Most every head guy has his favorites.
For years I've heard "that will never work" and he's leading the pack. Best this is to read it all and gleen what you need for your application..Good Luck
