How low on the block? It could be the oil filter adapter. I had one that was cracked and would leak a slight amount. It could also be the oil pan gasket - or worst case the rear main seal.
I had a combination oil pan leak and filter adapter leak on my car it would leave some pretty good puddles.
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Ken
'68 GTO - 464 - Ram Air II heads - 236/242 roller - 9.5” TSP converter - Moser 3.55 Truetrac ( build thread | walk around)
'74 Ventura 350
'69 AMC Javelin SST
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