Rare but there are a few out there. Most are twin 4.3 or 5.0 compared the single big block. A single drive is less drag in the water and a single big block is less weight then a pair of big blocks. For just 2 folks and a few dogs you may be ok but I would not buy it or any boat without a test ride carrying the weight of what you expect to normally have on board. So if you test ride with the owner and yourself that will equal how you plan to use her so you will get the feel for how she handles.
IMO a single engine in this size boat can make docking a little harder, however if you perform your own maintaince it will be easier with more space to work.
1997 2400 SCR
5.7 Vortec / Bravo 2