1967 Galaxie 500 cylinder heads

[galaxieman]

I have an exhaust leak right bank in my 390 ci 2 barrel engine. Mechanic says he cannot remove bolts from either the manifold or heads, they are seized that bad. Mechanic is very experienced with all cars but says he has never seen them this bad. Has anyone out there ever run into similar problem? I guess only alternative is to 1) run the car the way it is until engine needs rebuilt (103,000 miles)but runs fine, or 2) bite the bullet and pull heads and take to machine shop and helicoil any damage? Any ideas appreciated. Money is a consideration, as I am currently knee deep in another project! Thanks, galaxieman