You can hang any HP motor on whatever boat you want, liners are excluded to rev to their max wot rpm range factory stated. Just expect displacement speeds on the portable ones and plane speeds on the larger ones provided that are propped right and run healthy.
For that project need to install an induction tach if boat doesn't have one to count with, go for a wot spin as loaded on flat calm water and check max wot rpm achieved with delivered prop, surely will need to drop some pitch down to compensate for less hole shot that will achieve with a 70 compared to a healthy 90 HP.
It's fun to play with load, tach and middle to max wot rpm range to get the max out of that combo running a underpowered engine.
Happy Boating
