With a high milage motor putting fresh heads causes a great deal of problems. Especially if your rings are on there last legs, it could cause them to fail leaving you with an engine that will need to be totally rebuilt.
I not saying you will have problems just point out this potential. A valve job would be recommended, a long with new guides and maybe even a few valves may be needed to finish the job. make sure who ever you have do the Valve job can tell you they will adjust the installed height correctly otherwise you will have lifter noise after you are done.
This can be fixed by using shims to raise and lower the rocker arms, you might even install roller rockers with the head swap.
My guess would be a 3 angle valve job with new springs and valves as needed would run around 250-400 bucks depending on parts selection.
IHM
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