Danny and Miles, thank you for the warning. I greatly appreciate the helping nature of this group, and constantly leverage these conversations get things resolved on Feierabend.
I'll contact Amel to get a little more insight into their warning. The other SM I mentioned (1991 vintage) has had the Yanmar 110hp installed since 2006 with no issues (and was actively used). I have a Maxprop which may provide less stress than a 3 bladed fixed prop?