Got my junkyard magnum motor in the 11s!

My build and car are very close to yours except I have a little less cam 512@278 degrees112 centerline and I have a 3.91 instead of 4.11, 3500 loose converter. and a 750 holley vac sec with a proform carb body. I will be tickled if it runs 12.70 unassisted as I will be putting a 150 horse nitrous kit on it. Im shooting for mid 11.50 in street trim thru the mufflers. I want to be able to keep up with the Stangs and Vettes that are running 11.70-11.80 from the factory.