1. I'm a stock horse person, mostly. One of my mentors has generously taken the time to teach me all she can about QH, TB, and Paint pedigrees and breed history. Speed blood seems to be a very important factor in quality horses, and by speed blood I mean (if anybody knows about these horses) Three Bars, Leo, Barred, Beduino, Depth Charge, Top Deck, Depth Bars, Easy Jet, Ed Echols, Go Man Go, Grey Badger II, Jet Deck, Lightning Bar, Maddon's Bright Eyes, Midnight and Midnight Jr, Chicado V, Tonto Bars Hank... Those are all pre-1970s or so, going back to the early 1900s. Those kind of horses are influential in a stock horse pedigree. It's speed blood. They raced and proved themselves in match races, on the track (AA or AAA), and/or they produced champion racers.
2. However, every single one of them had near-perfect conformation (a far cry from what you see nowadays), and most of them could halter.
3. speed blood important in good quality Arabian pedigrees?
4. What are the old speed blood horses?
5. Are modern day racing Arabians still pretty conformationally correct, or have they strayed off the breed ideal?
For the purpose of answering all your questions, I have divided and numbered the post I quoted above.
1. Yes those are all off breed, as you said.
2. Good horses always have near perfect confirmation. They need it to perform the tasks they are required to do. Thats why they start young horses out in halter. If a horse has bad confirmation, chances are, it will not race, jump, or otherwise perform well...does that make sense?
3. Speed blood is most likely important in arabs bred for racing, but the most important thing is to be properly trained and confirmationally correct. Bloodlines only equal dollar signs, when it comes to winning, they have to be bred by someone who knows what the flip they are doing.
4. I'm sorry, I have no clue, I can't answer that one as I personally believe names are important only to a certain extent.
5. People often forget arabians, are horses first, a breed second...even though we say Arabian Horse, they are still horses that happen to be arabs. Generally the confirmation ideals from breed to breed run into each other, although our breed tends to vary slightly, quality confirmation tends to follow the same line as most breeds. The only difference I have noticed between the show arabs and the racing arabs is the head. They tend not to be as refined, but other than that as I said before, in order to race well, they need to have proper confirmation.
Hope that I helped