I'm running a MY94 modded STi Version 1, the spark plugs fitted are NGK Greddy 8 T7340-8 would anyone know where I could maybe find these for ordering on line? Would Halfords or my local Auto Parts stock such a plug??

 

Try NGK PFR7-B's instead

 

Are the T7340-8's a cold running plug, would the PFR7-B's be a safe alternate?

 

Ran 7B's in my old MY99 STi Type R with no problems, loads of Scoobynetters use them as well, checkout
http://shop.scoobynet.co.uk/Product.asp?ProductID=384

Or ring stockcar at http://www.asperformance.com/

 

Would I need to set the plug gaps to the same as the old ones (0.30)

 

Not sure, usually set at 0.7mm