High-mileage 915 J heads... can they be fixed?

Rock Auto has nice reman heads available for '76 D200, 587 heads pretty much same head as your 915 Js.

They do a really nice job on the reman work, ship out in plastic containers so you can ship your cores back in them and get your core refund back.

Their 72 915 J heads are out of stock now.

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That looks like a good option, I'll keep that in mind depending on how costly it'll be to fix the heads I have.

Although my lease at my new place will start in August there's no rush to move out of my current place since it's my parents house lol. But I don't want to wait longer than I have to.