Mostly it depends on weather YOU will be replacing parts on your boat , or a hired wrench will be doing the work.
Many wrench turners will not guarentee any work with used parts.
To me (I do my own work) $500 might be worth it as insurance.
If I has an ancient 120 , and this was identical, I would tear the head off and have it rebuilt as well as as many parts that will swop out.
I would pickle them and carry them on board as spairs.
If I were going offshore I would install them and have the existing parts rebuilt and use them , as my spairs.
I would save the remains ,the basic block, for a good rebuilding should that become necessary.
-- Edited by FF on Sunday 14th of August 2011 06:24:07 AM