Bell is a good book to learn by, but I feel that Jennings had a bit more practical info. Bell's book can be found on Amazon for a pretty decent price. There a few more books with some very arcane information, but good luck finding them in digital or analog formats. I tried for nearly 3 years and gave up. I don't even remember what they were called. Camatv on BHQ knows what they are and is/was searching as well. A bit of searching will come up with the names.
OP, I support anyone wanting to do everything themselves and will quickly provide all the knowledge that I have, but please be informed that it takes more time and money than most people are up for. I've found it easier to work overtime and pay for it to be done, but that's just my situation.
Lastly, my primary motivation is that I want something that will outright fly in every situation and I know that I am not most cut out for doing it as well as I want. Had I built my last engine, I'm certain that it wouldn't have made the numbers that it made over the RPM range like it did. For me, the overwhelming amount of acceleration is more satisfying than saying I did it myself. Some people jump to that way of thinking after the frustration of DIY builds up.
That makes since, after doing some pricing on everything I'm starting to see why they are very proud of them tools as much as they cost