I would agree with MarkPierce. I had a '62 model ChrisCraft Constellation with a
hull very much like yours. It was great in flat
water but following seas like what you might encounter
offshore could get very hairy for a boat like yours. These
boats are made for planing speeds and though you will get better
fuel mileage at
displacement speeds, the
boats don't handle well at slow speed with following seas. My mileage was about 2-3 mpg in flat
water at 1200
rpm. About 5 knots. You could expect similar numbers but less in any kind of seas
offshore. I'm not saying you couldn't do this trip in your boat but I would be very cautious about the
weather and range.
Kevin