I'm curious as to why you are asking these (excellent) questions AFTER you purchased the RIB?
IIWY, I would phone Wolf Rock and (nicely) ask if they fitted the motor (good to know anyway) and if the height was determined by them or did the buyer spec or supply the motor fitted. You'd be AMAZED at how many people INSIST on fitting a wrong sized motor (HP or length) to a new RIB...
If the motor is confirmed as fit for purpose, then I'd test the RIB and watch the telltale during use. You'll need full trim down for turns, most likely. Why would you butcher a transom without testing it??
What IS the shaft length on the motor? S, L, XL?