Welcome to the board.........
Price.....................depends on condition, if it's real nice doesn't sound bad
Adjusting valves...is easy, check the board for some tips and buy a manual
Rebuilt engines....prices are all over the place depending on how good, why not rebuilt it
yourself or find a good used one if you need it?
Install..................again depends on where you get it done, call around your area to get
estimates, then again it's not brain surgery you can probly do it!
Zag