4.3 performance

[t mac]

This is the second time I am posting this question. I put it in general category the first time instead of performance. My mistake.

Hello all. In the process of looking at a 1978 Wellcraft V20 cuddy with a Mercruiser 4.3 Vortec. I am not sure if its a 2bbl or a 4bbl. Either way I was looking for some opinions on the expected performance. I would appreciate some info on both the 2 and the 4. Thanks guys and gals.