Intake turbo seal leak

Right, ive thought ive had a leak in me air system and it seems to be the gasket on the front of the intake before pressure is made.

Its around part 16523-M on the below page;

http://www.courtesyparts.com/z32/oe_turbo-hw.html

The leak seems to come out round the top side of the gasket.

I tightened up one of the bolts a bit but cant see how its physically possible by anything other than a shrew to get at the other bolt round the top of the pipe, this is trying to get at it from under the car. Is it possible that if that bolt is loose it will be causing the leak or is the gasket nackered? Is that a common problem?

Pressurising the system from the MAS, air just poors out??

People reckon the turbo's gunna have to come out and hence the whole engine?

A clutch is gunna be fitted soon, while the gearbox is off is it worth trying to get at?

Ive grown to love my rather poorly Z but god the Nissan engineers are buggers!