Keep stock cam and add more valve spring to get another 500-600 rpm out of it.
I read it's an old stock '77 360 motor, so I wouldn't do much other than headers and tuning. Just build it from the pan up, it's almost too cheap not to.
9.1 pistons are 155 bucks all day long on ebag.
Rings 25, bearings 80, 300-400 matching on block...then you can pick a lot nicer cam and have what you want.