Thanks Joe, I'll probably stay away from the oven cleaner and just use extra elbow grease.
The oil leak was from a valve cover gasket that had apparently dry rotted. The car sat in storage for quite a while and was rarely driven by the gentleman I bought it from.
Unfortunately, some oil had already leaked down to one of the exhaust pipes before I realized the problem. However, I strongly suspect there will be no more problems w/ leaky valve cover gaskets considering the motor was pulled from the car shortly after.
Thanks again
Darrell
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1969 Camaro RS/SS L-78