balls?
It is cheaper to buy a new engine 5,000+
buy a new engine. your head gasket has gone bad, a rebuild is not a good idea because your heads could be warped. run it till it blows up, buy used motor.
Replace the Mazda engine.
That depends alot on the maintainence and the way it is ridden. Also is it an evo or twin cam? Evo are known to last 200K miles. Twin cams are not as durable and it is cheaper to buy a new engine than rebuild.
You might rebuild or buy a new house
If the engine is original, use standard oil. If the engine is new or has had a full rebuild, using synthetic oil will result in a longer life for the engine.
Buy a rebuild kit and remove all of the old parts, replacing them with the new ones.
You might rebuild or buy a new house
While purchasing a brand new car may seem to be the more expensive option, merely repairing the engine could cost more in the long run. Repairing a car's engine runs the risk of the engine breaking down again and some engines, especially old ones, may be beyond repair and trying to do so would be a waste of money.
buy a new engine
Any time you rebuild the engine you should always put in a new timing chain. They are far more durable than a timing belt.
For a complete rebuild? Forget about spare parts and buy a crate engine, comes complete and under $1000. Beware of used engines, they can be found for about $600 and that extra money for a new engine (a crate engine is as good as a brand new engine) is money well spent