[130fe]

I am in the process of installing a surefit kit in my 68. Unfortunately the S&P brackets will not be here in time, so I wiil be doing the Power Tour without air. The VA defrost vents (designed for camaros) fit OK. Basically you have to fit them as close as you can and then mount them with a sheetmetal screw.
I saw you had a question for the center vent. I am assuming you want to use 67/68 style factory one. There are a few pieces to it. There are-
1. center vent (directs air out of it).
2. Trim that retains center vent to factory air housing.
3. Factory air housing (black ductwork) that the air hose hooks to.
4. VA factory air housing hose adapter
5. 2 small pieces of felt that fit on the rollers in the center vent. They keep "tension" on the center vent so it will hold a certain position.

I can email you some pictures if needed. One of the recent mags just featured a LS2 install in a green 68 (was a series) showed the install of the same kit you have. Will have to find it. BTW, if anyone needs a 67/68 center vent VA factory hose adapter let me know, I have an extra. Pay shipping and it is yours.