The Heater Core is behind the dashboard and is very difficult to replace. The entire dashboard must be removed to facillitate repair. There is another web page which I have that details the dash removal procedure. As soon as I can I will submit the procedure to this website.
This questions has MANY answers! It depends on the horsepower gains you prefer, vehicle use, the amount of money you want to spend. In stock trim a 1984-87 300zx has a T-3 Garrett turbo, while the 1988-89 came with (I think) a T-25 or T-28 turbo. Alot of people in the "Z" community upsize to a hybrid or a T3/T4 turbo. The benefit primarily is it maintains the stock bolt pattern, but more importantly it allows higher boost due to the larger T-4 compression side of the turbo. It has the low rpm spool capability of the T-3 but higher boost aspect of T-4 turbo. Beyond this may require custom manifold fabrication and mounting bracket to except a larger turbo. I have seen Z31 Series 300zx (1984-1989),making close to 500hp on similar T3/T4 upgraded turbo. Call any reputable turbo shop, they should be able to convert you stock turbo to upgrade form.
The 300zx is a very particular car. It depends on where you get the computer from. I have swapped a non turbo to a turbo with the same engine except my new motor was from japan. the computers were slightly different, but nothing a little modification wont fix. As long as you get a computer off of a motor that is the same model as yours, it must be from the same model, several years have the same model (1984-1986) then you should not have any major problems.
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