Hi Paul - the guys are right. Keep your vehicle matching numbers by retaining that engine. Pontiacs are sturdy motors and a rebuild is worth undertaking. I did mine myself, but the machining was $4k. The parts were about $2k but I replaced EVERYTHING. If you employ an engine builder to do the job, I reckon you're looking at $8 - 10k. That sounds expensive, but it'll outlive you once completed. Oh, and put in a waterwheel type water pump and a decent radiator. Your new engine will thank you for it.
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Fitzy's post in Good engine for my '61 Bonneville? was marked as the answer