Strad - very interesting indy videos indeed (1960, 1970 and beginnings). Where are they coming from ?
As a young kid, I had mainly written report about the 500 back in 70's. I remember the 1971-72-73 races with the big Mc Laren M-16 Offy, Dan Gurney's Eagle (200 mph - 1000 HP). After the 1973 Swede Savage (STP Eagle), the indy racing changed a lot (smaller wings, smaller tank, waste-gate, + improved Brickyard, quali and so on) for satety reasons but the racing was still okay.