The BS flag has been raised
82, I really don't know what to say, except what ever your smoking is alot stronger than what I got!
Please, almost stock ( which yes your are) and running 150 - Okay. And how do you know when your going this fast are you reading your 85 mph speedo or did you upgrade to the 130 oh yeah thats still shy of 150. Let me guess radar at a track - I don't know of a track that will let you go turn 150 mph laps without a roll cage you didn't mention having that, but that would also add weight to the car which it sounds like you've been trying to strip out.
HP wise you may have 140 at the wheels but possibly less, with the weight of the car, drag coefficient and that amount of power it is physically impossible unless you were racing down a steep hill.
And those wide low profile tires are not helping your top end, they hurt it and add all kinds of drag.