I have a Armstrong bracket on a Sceptre. I went with the Armstrong because I found it for 200 bucks. It seems to work well. When I first put it together, it had a 250 merc efi on it, now it has the Suzuki 250. I did move the batteries forward.
As for balance, I used to carry 100-150 gals of gas, now I carry 60-85, so I am actually lighter than I was with the efi, but there is a little more weight in the back.
If have a thread on the rebuild at
http://www.classicseacraft.com/forum...rev=#Post57221