ok, so i bought my first 240Z a few weeks ago, and it was running really sluggishly, so was looking around, and i saw that the hose to the advance was missing, so i fixed that and it gave it more power, but still not close to what it should have, so i checked the spark plugs, and number 4 was wet. I took the compression, and all the others were around 145-130, #4 was 0. so i took the valve cover off, and there was a rocker missing! so i got a new one, and as i was putting it on, i noticed that the valve spring was sitting much lower than any of the others, just wouldn't come up. so i just took the head off, which was fun for my first time taking one off, and thank god for the shop manual or the chain would have slipped down for sure. so i take it off and it seems that the admission valve seat has come loose and its stuck between the valve and the head. so i was calling around to find someone to rebuild it, and i got some qoutes saying anywhere from $125+parts to $250, new head and valves. to $1300 for a valve job. My question is how much should i be willing to spend, and for what? sorry for the long account, i'm just excited about my first project.