Not to disagree with Nick, but in my opinion & experiance there are much better options than Jasper when it comes to re-powering. I'm sure there are some that have had good luck , but I'll bet there are more with bad experiences with there marine line. Good choice to upgrade to a 5.7 as well. Everything will transfer over from the 5.0 and assuming it is Mercruiser the 1:50 outdrive ratio is the same between the two.