I got same engine, similar bracket. It provides some flotation, not a huge amount, but enough to keep me self bailing w/ 2 people, any more than that and water is coming in the scuppers (which was fine by fine for 2 years of running the boat, if more than 2 people I'd just plug em and unplug them while on plane to drain).
I have hopefully resolved this issue by sealing the scupper holes and moving my scuppers to drain through the transom covered by the ping pong ball style blockers.
I unfortunately didn't take any pictures while mounting the bracket (quite busy during mounting
) but good luck with it!