I am not new to cars and engines but I am new to Nailheads. The engine in my LeSabre is a rebuilt stock (as far as i know) 364 low compression. It has a 4 bbl intake and Edelbrock 600 cfm carb on it. Timing is at 30 degrees, all in with vacuum plugged. Distributor is connected to the ported connection. I finally got to get out and drive my car some today and decided to "get on it" a little and see what she'd do. What she does is about the time she starts making good power, the valves float. Fortunately, it doesn't appear that it did any harm. I don't have a tach, so I can't tell you what RPM it's floating at but I believe it's less than 4000, maybe 3500. The engine would rev willingly if the valve springs didn't give up the ghost. Is this normal for this engine? How close are the valves and pistons? I am trying to optimize the governor in my TH350 but it looks like that is not gonna happen unless I fix this other issue. Advice?