T38 500......NO
GT30, OR T4.......Low comp, not nec for 450/ Clutch/ head gasket/feul pump/head work..........brakes
Go to this link

oh, and a nice bank manager
Just out of interest, why are you after numbers, a well set up stage3 car is aewsome to what you have now

dont get carried away with the magic 500

its nice, but you will need alot of pennies
http://www.norrismotorsport.co.uk/