Yamaha 200 HP Outboard repair head corrosion leaking water into cylinder seized

The Yamaha 200 horsepower outboard is almost 30 years old. IThe saltwater finally corroded a hole through the head and was leaking water into the combustion chamber. The salt waster seized the engine. It was a rust seize and so we were able to free it. We picked up a cheap pair of heads on eBay and now were back in business.

CRC SX128 Salt Terminator Engine Flush, Cleaner and Corrosion Inhibitor - 1 Gallon
https://www.amazon.com/gp/product/B00546F77G/ref=as_li_tl?ie=UTF8&tag=fintechcomm0f-20&camp=1789&creative=9325&linkCode=as2&creativeASIN=B00546F77G&linkId=27cc19d21d061020138d3d97c2339792