'79 widebody

[knorwj]

ok so just to let you know i have no idea about anything datsun related.
but... a friend of mine just recieved a really sweet looking datsun in trade for painting someones car.

the for sale sign reads 1979 datsun 180zx widebody.
now my questions are,

is the widebody factory equipped? (looks sooo nice!!)

how rare is this car? how much is it worth? (I have never seen this type of datsun (widebody) before?

and how hard would it be to restore? I may try and buy it from him if its worth it ( I really like the way it looks!)

also what type of engine is in it?
and if anybody has them maybe a few specs of this cars performance.