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Nothing new is going to compare to the great power to weight ratio you have with your current motor. Nothing produces that kind of horse power in that weight range in today's world. But, nothing uses that much gas either.
I looked into this for my 22 Revenge and decided to rebuild the 1987 225 Evinrude (1992 is a much better motor)and purchased a new Yamaha 9.9 High Thrust kicker. The two combined weights are close to what 1 new V-6 4 stroke would be.
This weight also compares to what two 115 two stroke outboards that were often rigged on these boats in the late 70 to mid 80's.

The closest compromise is Yamaha's I-4 Series 4 stroke that weights just under 490 pounds for their 175-200 hp motors.

Vance