115hp yamaha 1987 model Should I use Stainless steel for head bolts or not.

[uptheriverwithoutapaddle]

Hi I have taken the head and cooling Jackets/ exhaust cover off my 115 hp Yamaha as it has been over heating and I needed to clean everything out. Some have suggested I replace the head bolts and all the cooling cover bolts with stainless steel bolts. This raises some questions in regards to stainless to aluminum corrosion as well as should they be high tensile. I was also told I should put in stainless heli coils to solve that problem but I cant get to all of them due to the engine cover on the motor. Should I just use the old bolts any ideas.