I dont see a reason not to us them. Very important to have the right spring package for the cam you will run, roller lobes are available in different levels of aggresiveness and each needs to have a spring for its needs. You should try to find out with whatever cam you end up using who made it and what series/lobe numbers it was ground from. I would take the heads apart to clean them, check the valve guides and valve to guide clearance, check the retainer to guide/seal clearance so you can determine the max valve lift you can have. The surface finish looks a little rough in pictures, and that may limit the head gasket choice you can use.
