lol I have a 14 ft Glaspar G3 with a 75hp evinrude.......
I have seen smaller boats than yours with 200hp......very extreme and NUTS but it is what it is.........
if youre just looking to tool around safely....a 60hp or less is better suited...but the 80 will be fine too (just a bit stern heavy) just dont punch it too much!
The weight difference between the 60hp and 80hp evinrude v4 is only 3 lbs, don't know about merc.
My 16' fibergalss boat has a 70hp limit, the max rated hp depends on hull and transom design.