Compression should be in the 8.5 or so advertised range. With the proper selection of parts it can be made ok (maybe not great, but still worth doing). The big limitation as I see it (from all that I have read, not done) is that too much cam will really kill the power capabilities. You can start from scratch with that motor and new pistons, but unless you are trying to make a lot of power, it might be money poorly spent.