Our engine operating manual covers three versions of the "FL 120." These engines are based on the Ford of England Dorset diesel. There are a lot of subtle cubic inch variations in these engines and they're easy to overlook.
The first one is the" FL80." It's based on Ford of England's four-cylinder version of the of the engine called the 2712-E. It is a 254 cu in engine and develops 80 hp @ 2,500 rpm.
The second version is what we have,the "FL120." It is based on the Ford of England 2715-E six cylinder, 380 cu in, naturally aspirated diesel. It develops 120 hp @ 2,500 rpm.
The third version is the turbocharged version. Ford called it the 2704-ET. It is a six-cylinder, 363 cubic inch, turbocharged engine that develops 150 hp @ 2,400 rpm.
The Lehman model numbers for the marinized versions of these engines are 4D254 for the 80 hp four cylinder, 6D380 for the 120 hp six-cylinder engine, and 6D363T for the 150 hp six-cylinder turbocharged engine.
Lehman of New Jersey marinized a lot of different engines over the years, a number of them from Ford of England. As the turbocharged engine you are describing is 160 hp, I suspect it's not one of the three I listed above.
Lehman also marinized the later Ford of England Dover engine. This is the base engine for the "Ford Lehman 135." Lehman actually called them "SP" engines for "Super Power." Ford of England made four variants of this engine.
The Ford (and Lehman) numbers are:
2722E (Lehman model SP90), four cylinder, 254 cu in, 90 hp @ 2,600 rpm.
2725E (Lehman model SP135), six cylinder, 380 cu in, 135 hp @ 2,600 rpm
2726E (Lehman model SP185), six cylinder 363 cu in turbocharged, 185 hp @ 2,500 rpm
2728E (Lehman model SP225), six cylinder 363 cu in turbocharged, 225 hp @ 2,450 rpm
2728E (Lehman model SP275) six cylinder 383 cu in, turbocharged/intercooled, 275 hp @ 2,500 rpm
Again, no 160 hp turbocharged engine in this group. So I don't know what Lehman engines are in the boat you are considering.
The above data was taken from our FL120 manual and the SP-135 manual on the GB owners forum.