I have just removed the Chrysler 440 from my 27-ll and would like to replace it with a single diesel. Any suggestions ?

I have a Coronet OF 32 (5,5 ton) with a single 315 Hp 6 cyl Yanmar. Speed; top/cruise 29/26 knots. The engine is equipped with a silenser which makes it fairly quiet, 6 cyl = low vibration, fuel consumption at 25 Knots is below 2l/nm.

I HAVE A SEAFAHRER WITH A 6 SYLINDER VOLVO PENTA AQAD41A (200HP). CRUISE SPEED IS 24-25 KNOTS AND TOP SPEED IS 30 KNOTS. THE BOAT IS EQUIPPED WITH DUOPROP A6 PROPELLERS. AT 25 KNOTS THE ENGINE TAKES 33 LITERS OF DIESEL PER HOUR.