Looks like it's in very nice shape, well kept.
It's gonna be slow with that 9.9. That size boat would be much better off with a 25-35, if it's rated for it.
Send the seller a message for a picture of the data plate, it likely has the model on it.
I suspect it is a pretty standard 1648, 48" across on the floor, with a beam around 60-72".