Ok -I've gone out and tried firing it up a couple times since my last post. The clanking is now a full on banging and squeaking. I still have great oil pressure. Like I said, it was running great before I changed out the motor mounts.

Oddly too -the "stop" lever was all the way down while the engine was running, and when I was checking around on that side -engine off -I bumped one of those plastic vacuum lines and it disconnected, and the "stop" lever popped up to where it normally is -does this make any sense? I don't know much about those lines -just enough to re-connect them when they get disconnected.