Jumping in with Both Feet on a 20 Seafari

[SailorChlud]

Actually, Sparehead - I am not sure about the bolt locations myself. They may or may not be accessible under the splashwell. I will not be mounting the motor, a local Evinrude dealer will be, and I really won't have that answer until later in the spring. I will try to take photos of whatever we do and post them at that time to give you an idea.
As to the sticker, I had a new sticker made up at https://www.garzonstudio.com/boat/capacity-decal.html

I cannot tell you what to do regarding the max HP but I believe Fr. Frank can help you with a formula for that.
Good Luck with your project, and post some photos!