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I bought the Fel-Pro bottom end gasket kit for my 383 LT1 build, but what are these large and small o-ring type seals for? I don't recall anything like them during the tear down.
Yep the small ones are for the waterpump driveshaft. The larger one looks like the seal for the factory oil cooler on 93-95ish LT1s. Goes in between the block and the cooler.
I don't have an oil cooler so I am good there too. That does make sense as they are the same size as the oil filter area.
Yes because the oil cooler is part of the oil filter setup. In this order.
Block-Gasket-Cooler-Gasket-Oil Filter. But since you don't have one, you just need that paper gasket (the one you show in between the timing cover gasket) that goes behined the oil filter plate and then obviously your oil filter has it's own gasket.
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What Are These Seals For? 
