I can't speak to your exact situation. But in general, with a jack plate, there's a couple things to take into account.
It will change the geometry of the torque applied to your motor mount. It only takes a very few inches to drastically increase the torque. You might contact the manufacturer and ask them if a jack plate with x" set-back and y" lift
and n hp should be OK. Otherwise, check with a performance speedboat shop and see what they think. If your boat is rated for much higher engines than you are using, you got a better chance it will be fine.
Also, a jack plate will add a set-back. Probably not a factor in your case, but I'll mention it anyway. The set-back is normally only a very few inches. This can put the prop at a different place in the water
hump caused by the hull
. This can help or hinder. For high performance boats, we always tried to get the motor hitting the water
a bit (that's a technical term) behind the highest point of the hump. An efficient sailboat hull
probably does not have enough of a hump to be a factor. The set-back can also change the mounting torque, but I can't imagine in your situation it would be enough to be a factor, either.
The torque factor is the biggie. Most quality boats should be able to handle the extra torque added by a jack plate. But it would be embarrassing to be offshore
in nasty weather
, hit the throttle hard to straighten up while climbing a huge wave, and suddenly have one of the engines unceremoniously part with your company, taking a large chunk of the transom with it.