merc 120 in my 79 glastron ssv-177?

[Tonyscustom]

I have a 79 glastron ssv 177 its about 17 ft, open bow v-hull.

I need a new motor and the only one i have been able to find is a mercruiser 120, whereas the old motor was a mercruiser 140 (will this transfer work?)

several people have told me i could bolt it in no problem (is this true) and assuming they're right...will this motor be big enough for my boat?

there isnt too much of a difference between a 120 and 140, but im afraid it would be powerful enough if i ever try to pull someone on a wakeboard or something like that.

please help, everything ive read about on this site has helped a lot but i couldnt find anyone whos done this before.

thanks