Where are you located?

It is to hard to say how much it will cost without stripping down and inspecting. I would recommend removing the cylinder head & getting it sent off for crack & pressure testing and a reface while you get the valve stem seals done. In regards to rings, the block MAY require some machining depending on the condition of it, but at the very least, the cylinders will require honing and I would replace bearings as well.

Depending on what you plan on doing with the car, it will probably end up cheaper to look into a 2nd hand D16Y1 or upgrading to a B or K series (depending on budget)