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Looks like progress! Bet that manifold leak was noisy. If it was blowing hoses from exhaust gas getting into the cooling system, that suggests you were right about the head gaskets. Check for cracks and warpage while it's apart. The oil in the valley probably came from the valve cover gaskets. That depends on how far you go. The VG30 and VG33 service manuals have identical specs for the valve springs, so the stock springs should handle VG30 cams just fine. JWT even recommends the stock springs with their S1 cams, which if post #7 in this thread is correct, are a larger jump in lift from the VG30 cams than the VG30 cams are from the VG33 cams. JWT's S2 cams do spec harder springs. And yeah, if you're pulling the heads apart anyway, that would be a great time to clean out the gunk and lap the valves. Mr. 510's VG34 thread has some info on porting if you want to give that a go.1 point