Congratulations on your good taste.
There's nothing like a Magnum.
I have a 1972 Magnum Sedan that I bought 10 years ago. It has the same hull as yours, but a bigger cockpit, sit up cabin and walk around decks. I repowered with twin 350mag/bravos. The boat has a great ride and goes 65 on radar. There's a picture of mine buried in the reader's rides section. If you want to see more pictures of other 27's, go to thunderboat alley.com.
Enjoy