'60 and earlier Pontiacs had different engine mounts - there was a single one in the front that bolted to the bottom of the timing chain cover and two at the rear (I'm not sure exactly how the rear ones worked.) I believe the timing chain covers on those earlier engines were steel or cast iron, while the later ones were aluminum (they still had the same mounting bolt holes at the bottom edge like the earlier covers.)
I once saw a car featured in a Hot Rod magazine from the early 60s that had a later model engine bolted in using the early style front engine mount, and they claimed the aluminum timing chain cover stood up to the abuse.
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