Hmm, after tearing into the enging a little more I found that the distributor is waaaay out of time. So much that whoever worked on it last had to move all of the plug wires clockwise one post to get it to fire and the whole distributor body is clocked way over clockwise too so the vacuum advance is pretty close to the firewall. Sounds like I'll need to pull the distributor and drop it back in the right place and get the motor timed before I try to track down why I'm getting the rich/lean issue, no?