I am looking to see who has had higher hours without complete rebuilds, who has over 500 hours?

mine...which has head work, slightly bumped compression and a 741 cam, has three hundred hours on it since a rebuild. It was freshened up at 150hrs when it dropped a valve seat, new heads were installed, it makes 550 horse on the dyno. It still runs great, no oil consumption, carries 60 psi under load, 40 psi at idle. Oil is changed every 25 hours.

I looked at a 29 Fountain last year that was still going strong at 400. But I will say the very reason you started this thread is why I crossed it off my list

Probably correct LOL