Engine question. Complete rebuild vs top half only
I have a question and would like some advise please:
I currently have a 1965 GTO with a 389 (Non-Numbers Matching) with a M20 4-Speed bolted to it. The engine cranks first time every time, zero knocks or pings. It is a tight engine but the valves are worn and I feel that pulling the heads and having them completely redone and leaving the bottom half alone with the exception on resealing it including new freeze plugs might be the way to go both from a time and cost perspective.
I have priced a turn key rebuild vs buying a built 389/400 vs just pulling the heads and the difference is a few thousand dollars at minimum. The car runs and drives overall very well now but does need at least a head job at minimum. If I rolled the dice and just did the head job then i have the funds free to invest in the interior sooner than later. (I would rather do what is right I do not want to cut corners but my gut tells me that this is the way to go)
Does anyone have any input in to the pros and cons of this? What are any suggestions and what should I look for?