What's my problem?

I've had the car for a decade, and never had paperwork on the build. I bought it in it's current state, and made changes based on my ability, taste, budget, and needs of the car. I've had a few of my mechanic friends look into the engine, and was told that it has high dollar internals. Since they did not do the initial build, I didn't think they had any right to produce a receipt.
This is the pickle I'm in.
I could rattle off brand names and components the car has in it all day, but the proof is in the pudding. I need to supply better photos.