I have a 84 volvo 125 that is frozen up and looking for a replacement.I have found a 77 4cl hp unknown yet.It is a diffront moter but the bellhousing is the same,it has 2 carbs on the outher side of my moter,the 125 only has one.I would like to know what hp it is,if possable and if I will have to change anything(somebody told me gear raito)like wiring.This is my first inboard and dont know alot about them.Amy help will be appreciated Thank you.