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Gaskets, once leaky, never stop leaking, unless they are teflon, and then only sometimes do they stop leaking. We don't have teflon gaskets on Alfas, so replacement is in order.
I'd replace the clyinder base "O" rings also, they probably will not seal after having the heads removed (age thing here...I'd replace these o-rings if engine had run for a year).
Your spark plug well seals and valve cover gaskets are the likely sources of upper engine external oil leakage.
Your upper and lower oilpan gaskets are likely sources of lower external leakage.
As previously suggested, replace your cam, distributor, and crankshaft (front) seals. If these are bad you WILL get oil on your new timing belt with, not immediate, but catastrophic results (bent valves). The oil on the belt doesn't necessarily cause slipping, but it does cause the rubber to go bad and then the teeth on the belt shear off.
hth
Scott
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