Blue pill or red pill = 675 or 920

Well the least you should do to them is, do a garage valve job on them, to at least clean up the seats. You can get a hand drill operated gizmo, and some valve grinding compound and do it. Look up "Valve Lapping tool attachment", on E-Bay they're cheap, and work great.
Clean them up good, after you get them apart, in a parts washer. Clean the valves also, a wire wheel on a bench grinder works well on the shafts. A good C shaped valve spring tool is worth it. Its not worth fighting one of those elcheapo things.
You will probably have to replace some valves, so get them from Rock Auto.
Put all new seals on, its worth it.
Clean all threads up with a good thread chaser, or tap.
Use your factory service manual, or get one.

Dave