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1970 911 Engine rebuild

Engine

Vehicle Information: Model: 911 ; Year: 1970; Body Type: Coupe; Engine (type, size, modifications): 2.2; Total Mileage: 93,000;

I'm going to do a rebuild of my stock 2.2 engine with the mag case. The car blows smoke during start-up,acceleration and when I back off. So I'm assuming rings and guides. A leakdown test was done about 20,000 mile ago and even then compression was borderline.Should I just do the top end or go into the bottom end also? Like most older 911's there is quite a bit of oil dripping from the engine so its hard to tell if the oil is leaking from the case seam or some place else.Should I buy the turbo valve covers? Will the expansion rate between the two materials be a problem?What type of head studs are the best/most popular today? Same for valve guides and seals.I have access to Porsche shop manuals for the rebuild plus the usual aftermarket books. The fan and case is pretty badly stained from the elements is there some way to clean it up so it looks better? A friend suggested a bead,walnut or soda media. I've tried the miracle cleaners I found at car shows they don't work on magnesium.

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