Engine 90-Installing used heads on 331

I have a DSS 331 short block which I purchased a few years back and am finally around to building it up. I plan to transfer some Gt40x 64cc heads from my stock 5.0 engine which have 35k on them. Was wondering as I plan to reinstall them, what should be checked/replaced on the old heads prior to installing them on the new block. The heads have seen just light street duty, so I know they haven't been abused and prefer to reuse them. Also im planning to carry over my cam, is it recommened

Thanks