I changed the engine in my 28' as follows:
Built an A-frame out of 2 X 6s. Looks like a large sawhorse, with the feet over the frame members on each side of the engine hatch, notched to not slip.
Used a chain hoist to lift the engine clear of the deck.
Laid 2 X 6 rails under engine and pulled it back to the transom with a come-along.
Used a handy tree branch and the chain hoist to lift it clear of the rail.
Pulled the boat ahead several feet and dropped the engine down into the back of my pickup.
I reversed the above procedure to put the new engine in. It was all pretty straightforward. Somewhere there are photos, I will see if I can find them.
1975 32' Flybridge Sedan, twin Perkins 6-354 diesels, 1:1.53 velvetdrives, 16 X 19 props. Merritt Island, Florida