[Sunroof]

Michael.
The 1974 through 1977 911's came with the infamous 2.7 liter engine and to be honest kept the Porsche mechanics in gravy through the 80's due to its inherit issues. The casings on these engines tend to separate from loosening studs and leaked like a sieve. Today, a 2.7 can be lovingly rebuilt and last a long time with the proper studs and sealing and thats what a prosepctive 1974-1977 buyer looks for first. It appears your engine might have to be rebuilt or resealed if this is the issue. You won't spend a fortune and you may wish to consider taking on the project yourself. Take a look at Waynes new book about engine rebuilding and see if you can take on this challenge. At a minimum you can save $$$$ by just removing and reinstalling the engine yourself. With the engine out, its a good time to look at what you can freshen up in the engine compartment (hoses, fittings, insulation, etc). It seems like you love the car and have the tranny issues in order. The 76 is a nice car (they started rust-proofing in 1975) and worth hanging onto. You'll find with coming to Pelican for help along with some great repair guides (Waynes 101 Projects, Haynes Repair Manual as examples) you can accomplish much on your own at home.