As far as your heads go they have to be checked out to know. If they are good cores for rebuild, then just having a good 4 or 5 angle valve job on the seats, back cut your stock intake valves, springs for your cam set up, and a minor clean up of the bowls, and shaving .030 or so off to bump compression a little are the best bang for the buck. If you have a set of 2.02 valves already or need to buy new valves then use them, but it isn't a lot of difference on your build level.
I would not spend 1000 on a used set of rebuilt heads. At that point the new speedmasters on sale are the better deal.
