fresh s12 owner

[Magical Trevor]

alrite peeps

I'm purchasing my first jap car (cannie wait!!), Its a 1989 nissan silvia s12 its a 1800 turbo automatic, and im looking for some information on these cars so i know if the 1 im getting is in worth it.
Its done 71,000 miles.
Its been resprayed in the same colour of red.
Its rust free and the underside has been undersealed.
Its had its timing belt tightend.
Its has an electric fan fitted.
Its been lowered slightly.
A reasonably new exhaust.
New bushes.
Electric fan.
Plus the usual bits and pieces Serviced regularly etc etc

And has been maintend to a excellent standard so good its been garage for 10 years and hasnt been on the to road since 2005! think of it as a 1:1 scale model lol.

Is there anything i should look out for with these cars? i dont want to end up with a shed and from what i can see its pretty minted the asking price the guys want £1500 + cost of a m.o.t.

I no alot of them are prone to rust in usual areas sills and arches. There is no rust under the spoiler as it was removed for it getting painted and replaced with an old skool supra spoiler not too big tho just enough to suit it.

I also have a few questions on this car as well, they are as follows..

1.What is the PCD on the wheels is it 114.3 X 4 ?
2. I have told by a resonably good source that the car should run on unleaded or super unleaded (super contains a higher octaine rating) the current owner has been putting in a additive (red X) into it tho coz he claims itll only run on leaded fuel and it seems to run fine with red X in system but i dont wanna put super unleaded into it incase it burns all the valve seats. What should i run the car on?

Thanks in advance guys
P.S Ill get pics up as soon as i get it