Your performance during the raid in which you joined us was quite up to par. it's almost unfair to compare an Arcane/Frost spec with Salamar's Frostfire Bolt spec which, when supported by the right gear, is probably one of/the highest mage DPS specs possible.
Your talents seem right in order, as does your raid behavior. In terms of gear, yes you still have some level 70 items. And they are also the hardest to replace; I know, because I haven't been able to replace my head or shoulder items yet either.
As for the cloak, I believe [Reanimator's Cloak] may do the trick, which drops from mobs in Heroic Drak'tharon Keep. Alternatively, Naxxramas itself has a nice collection of caster cloaks.
The head item you have is a bit on the low end of level 70 gear; [Cowl of the Dire Troll] from Drak'tharon Keep (Trollgore) or [Crown of Unbridled Magic] from the Cache of ERegos in the Oculus may do the trick. Else, Salramm the Fleshcrafter in Heroic Culling of Stratholme has the [Forgotten Shadow Hood], if you are into Spirit.
So, after this bit of analysis, it's time for the officers to make their call on whether to give you a trial run, or if they are sufficiently impressed by you so far. In either way, they have the final call on this. :)
thanks for the advise and i will do what ever i can to gear rest up so i will keep going to the instance and hope they will drops for me some time but i have no luck so far but hope it soon will change