PM me as well if you have Qs.
The 2.7L "issues" were addressed on my '76 by the previous owner. Just turned over 164K miles and still going strong. AND, "zinc-coating" started on '76 year cars ... I have no rust on mine (that I can see
).
Don is right on the heat and varying expansion issues (magnesium case, aluminum heads, various alloy studs). You have to look and see which emission control system this car has (thermal reactors or air injection pumps).
Here is a great site for
Middle year 911s.
He suggests that all US bound '76 and '77 2.7s had the thermal reactors. Some might also have air injection.
Jase