Well, according to NADA the base engine was 220hp. And 220hp has been a rating for the 5.0V8 for quite a long time. I don't think Mercruiser called a 4.3V6 220hp in 1999, but I could be wrong.
There is a 1998 model 2050 in FL that definately has a 4.3 in it. But it just says it's a Capri, not a Capri SS. But in Littleton, NC there is a 1998 2050SS that says it has a 4.3.
So I guess it could be either. You'll have to see the boat to know for sure.
sounds a little fishy. Is the 4.3 carbed(190hp) or MPI(220hp)?
The 4.3 could be the original engine. If you post the serial number from the engine there members who can look it up and tell you the history of the engine.